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The Story of Creation as Told By Theology and By Science Part 6

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"And the earth was desolate and void, and darkness upon the face of the deep."

These words carry us back to a time indefinitely remote. Eternity and Infinity are ideas which we cannot grasp, and yet we cannot avoid them. If we stretch our imagination to conceive of the most distant possible period of time--the farthest point of s.p.a.ce-- still we feel that there must have been something before the one, that there must be something beyond the other; and yet we cannot conceive of that which has no beginning, or no boundaries. The first verse marks out for us as it were a definite portion of this limitless ocean. "In the beginning," is the point from which time begins to run--"the heavens and the earth," the visible universe beyond which our investigations cannot extend. Whether other manifestations of G.o.d have taken place in Eternity, or other systems of worlds now exist in infinity, we are not told.

The heavens and the earth then are to be considered as comprising the visible universe, sun, moon, and stars, and their concomitants, which the eye surveys, or which scientific research brings to our knowledge. All are comprehended in this one group by Moses, and recent spectroscopic investigations teach us that one general character pervades the whole. Every star whose light is powerful enough to be a.n.a.lyzed, is now known to comprehend in its materials a greater or less number of those elementary substances of which the earth and the sun are composed. Whether any of these worlds were called into perfect existence at once, or whether they all pa.s.sed through various stages of development, we are not told, that in some of them the process of development is only commencing, while in others various stages of it are in progress, is, as will be seen presently, highly probable. But the narrative takes no farther notice of anything beyond our own group of worlds, and proceeds to describe the condition of the earth (probably including the whole solar system) at the time at which it commences. Its words imply such a state of things as corresponds to what has been said in the preceding section of matter, apart from force. No better words could probably have been chosen for the purpose. The only word which seems to convey any definite idea is in the following clause, where water is mentioned. Until force was in operation water could not exist.

Probably St. Augustine's interpretation is the correct one--the confused ma.s.s is called alternately earth and water, because though it was as yet neither one thing nor the other, it contained the elements of both. And the word "water" expressed its plastic character. ("De Genesi ad Literam" Liber Imperfectus, Section 13, 14.)

One other important point in these words is, that they negative the eternal existence of matter. The second verse describes it as existing, because it had been called into existence at the bidding of an Almighty Creator, as described in the first verse.

SECTION 4. THE FIRST DAY.

"And the Spirit of G.o.d (was) brooding upon the face of the water.

"And G.o.d said, 'Let light be' and light was.

"And G.o.d saw the light that it was good, and G.o.d divided the light from the darkness.

"And G.o.d called the light Day, and the darkness He called Night.

"And there was evening and there was morning, one day."

The first clause seems to belong rather to the period of action than to the precedent indefinite period of chaos, and may therefore be taken as marking the transition from the "beginning"

to the first day, better than as belonging to that beginning itself. The Jewish interpretation of the clause is untenable in the light of the doctrine of the Correlation of the Physical Forces. Till force was evolved there could be neither air nor motion, and so no wind. The words of course bear on their face an a.s.sertion of the action of the eternal Spirit in the work of Creation; but when we examine the position which they occupy, it seems highly probable that they have beyond this a much more definite signification. In them a sort of localized action is ascribed to the Spirit--a something very different from the idea conveyed by the often-repeated phrase, "And G.o.d said." What that something may be it is hard for us to conceive, harder still to express, but the following considerations may perhaps throw some glimmering of light upon the matter:--

1. There must be some point in which the Creator comes into contact, as it were, with His creature--a point at which His Will first clothes itself in the form of a physical fact--the point to which all second causes lead up, and at which they lose themselves in the one first cause, the Will of G.o.d. Now this is what all systems of philosophy require as their starting-point, but it is entirely out of their unaided reach. But these words supply that indispensable desideratum.

2. These words come in immediate connexion with the evolution of light. Light is throughout the Bible intimately connected with the Deity. It is His chosen emblem. "G.o.d is light." It is His abode.

"He dwelleth in the light inaccessible." It is the symbol of His presence, and the means by which Creation is quickened. "In Him was life; and the life was the light of men."

3. Light, as we now know, is only one form of the force by which the universe is upheld. But the phenomena of light lead us to infer the existence of what we call Ether, which is supposed to be a perfectly elastic fluid, imponderable, and in fact exempt from almost all the conditions to which matter, as we know it, is subject, except that POSSIBLY it offers resistance to bodies moving in it. [Footnote: Encke's comet shows signs of r.e.t.a.r.dation, as if moving in a resisting medium; but it is possible that that resistance may not arise from the ether, but from the nebulous envelope of the sun.] This fluid must pervade the whole universe, since it brings to us the light of the most distant star or nebula. As it is the medium through which light is conveyed, and as light is now known to be identified with force of all kinds, it seems by no means improbable that it is the medium through which all force acts.

These words, then, seem to suggest the idea that the brooding of the Spirit may have some connexion with the formation of that ether which is indispensable to the manifestation of light, and probably to the operations of all force; and that, if so, the ether may also be the point at which, and the medium through which, Spirit acts upon Matter. On the one hand, the facts that force, as used, is constantly in process of degradation, and that it is also constantly poured forth into s.p.a.ce from the Sun and Planets in the shape of heat, and so lost to our system, seem to indicate that fresh supplies of it are continually needed; while, on the other hand, the supply of that need seems to be implied in the words, "By Him all things consist." "Upholding all things by the word of His Power."

If this be so, we have a point up to which natural laws may possibly be traced, but at which they merge in the action of the Will of G.o.d, which is beyond our investigation. Here, then, is a solution of that great difficulty, which those who are most familiar with the laws of nature have felt in reconciling the existence of those laws with a particular Providence and with the efficacy of Prayer, since we have here the point at which all forces and all laws begin to act, and at which, therefore, the amount of the force, and the direction of its action, are capable of unlimited modification, without any alteration of, or interference with, the laws by which that action is regulated, and consequently without the danger of introducing confusion into the Universe.

"And G.o.d said, 'Let light be' and light was." It has already been pointed out that these words differ from those used in describing any other creative act. They are the only ones which seem to imply an instantaneous fulfilment of the command. Another matter which has long since been observed, is their exact harmony with what science teaches us respecting the nature of light. Light is not a material substance, but a "mode of motion." It consists of very small undulations propagated with inconceivable velocity. Hence of it, and of it alone, it could not be correctly said that it was created. To say that G.o.d made light would be inexact. The words which are used exactly suit the circ.u.mstances of the case. But the discovery of the correlation of forces has given to these words a much more extended significance, while at the same time it furnishes a satisfactory reason for their occurrence at this particular point. So long as they were supposed to refer to light simply, they seemed out of place. Light was not apparently needed till there were organisms to whose existence it was essential. But we now know that to call forth light, was to call force in all its modifications into action. It has been seen that matter and force are the two elements out of which everything that is discernible by our senses is built up. The formation of matter has already been described in the original act of creation. But till force also was evolved, matter must of necessity remain in that chaotic state to which verse 2 refers. To matter is now added that which was required to enable the progressive work of Creation to be carried on. The first result of this would probably be that the force of gravitation would begin to act, while, from what the telescope reveals to us, we may conjecture, that at the same time the whole incoherent ma.s.s would be permeated with light and heat, and some, at all events, of those elementary substances with which chemistry makes us acquainted would be developed, and the whole ma.s.s, acted upon by the mutual attraction of its several particles, would begin to move towards, and acc.u.mulate about its centre of gravity.

It has been shown that Laplace's Nebular Hypothesis, when subst.i.tuted for the action of a Creator, broke down in three important points. Of these the first two were, that it failed to give any account of the origin of matter, and of the first commencement of the action of Gravitation. These two defects are completely supplied by the first three verses of Genesis. We may probably see in the "Great Nebula" in Orion an ill.u.s.tration of the condition of the solar system when light first made its appearance. It is very probable that that nebula has only very recently become visible. Galileo examined Orion very carefully with his newly invented telescope, but makes no mention of it.

[Footnote: Webb's Celestial Objects, p. 255, note.] At present it is visible to the unaided eye even in England, where the atmospheric conditions and its low alt.i.tude are alike unfavourable. In Italy, where the atmosphere is remarkably pure, and the meridian alt.i.tude is greater by 7 1/2 degrees, it must be a conspicuous object, and had it been so at the time when Galileo was observing the constellation, it could hardly have failed to attract his attention. It was, however, noticed in 1618. It is a vast, shapeless ma.s.s, having its boundaries in some parts tolerably well defined, while in other directions it fades away imperceptibly; its light is very faint, and when examined by the spectroscope is found to proceed from a gaseous source. Professor Secchi has traced it through an extent of 5 degrees. When it is remembered that at such a distance the semi-diameter of the earth's...o...b..t subtends an angle less than 1 inch, some idea of the enormous extent of this ma.s.s of gas may be formed. Drawings of it have been made from time to time by our most distinguished astronomers, which are found to differ considerably. Great allowance must, of course, be made for differences in the telescopic power employed, and in the visual powers of the several observers, but the differences in the drawings seem too great to be explained by those sources of inaccuracy alone, and actual change in the nebula is therefore strongly suspected. Another nebula of similar character, in which changes are suspected, is that which surrounds the star A in the constellation Argo. This is being very carefully watched through the great telescope recently erected at Melbourne, and from the observations made there, it is probable that fresh light may soon be thrown on the subject.

The next act recorded is, that "G.o.d divided the light from the darkness." This is one of those pa.s.sages which we are very apt to pa.s.s over as unimportant, without giving ourselves any trouble to ascertain what they mean, or asking if they may not give valuable information, or supply some important hints. It is evident, however, that in these words some act of the Creator is implied, but when we inquire what that act was, the answer does not lie immediately on the surface. Darkness is simply the absence of light. It cannot therefore be said that G.o.d divided the light from the darkness in the same sense in which it is said that "a shepherd divideth his sheep from the goats". Between light and darkness that division exists in the very nature of things, and it could not therefore be said to be made by a definite act. Nor again, is there any sharp well-defined boundary set between light and darkness, so that we can say, "Here light begins, here darkness ends." The very opposite is the case, the one blends imperceptibly into the other. This then cannot be the meaning of the words. But the next verse guides us to the real meaning. "And G.o.d called the light Day, and the darkness He called Night." The division of light from darkness then is the alternation of night and day. When G.o.d divided the light from the darkness He made provision for that alternation. But we know that that alternation is the result of the earth's rotation upon its axis, so that the dividing the light from the darkness evidently implies the communication to the acc.u.mulated ma.s.s of the motion of rotation.

It does not clearly appear in the account of the first day, whether this alternation of day and night took effect immediately.

Certainly the introduction of it here does not prove that it did so follow. For there was no way in which the fact of the earth's rotation could be directly communicated to those for whom the narrative was primarily intended. They were ignorant of the spherical form of the earth, and so could not have attached any idea whatever to a statement that it revolved about its axis.

The only way then in which Moses could speak of that rotation was in connexion with some phenomenon resulting from it. The only such phenomenon with which the Jews were acquainted was the alternation of day and night. There was therefore no way in which Moses could record the fact except with reference to this ultimate effect. It does not follow that that effect was immediate. Beside the rotation of the earth, another condition is required. The light must come from a single source, and so when the act is recorded by which that condition is effected, the division of light and darkness is again noticed. The sun and the moon are set in the firmament of heaven to divide the light from the darkness. But that division was potentially effected when the motion of rotation was given.

The third defect noticed in the Nebular Hypothesis was, that it did not account for this motion of rotation. This defect, then, like the two preceding ones, is supplied by the Mosaic Record, and the hypothesis thus supplemented becomes complete. It is capable of giving a satisfactory account of the phenomena to which it applies. But as it is only a theory, and only points out a way in which the universe might have been constructed, it does not in itself exclude the possibility that some other plan might in fact have been adopted, and we have now to examine into the reasons for supposing that it was the method which was actually employed.

These divide themselves into two cla.s.ses:--those which render it probable that similar processes are now in progress; and those which render it probable that the solar system has pa.s.sed through such a process.

It has already been pointed out that the great nebulae in Orion and Argo seem to represent the condition of our system on the first appearance of light, and that changes are strongly suspected to be taking place in both; but we cannot expect to trace any single nebula through the stages of its development, since that development must occupy untold ages. All we can do is to inquire if there are other nebulas which seem to be in more advanced stages. It must at once be recognized, that if this be one of the processes now going on, it is not the only one. There are many nebulas "which have a.s.sumed forms for which the law of gravitation, as we know it, will not enable us to account--such as the Ring Nebula in Lyra, the Dumb-bell Nebula in Vulpecula, or the double Horseshoe in Scutum Sobieski. But some nebulas can be found which arrange themselves so as to ill.u.s.trate the stages through which we may suppose our world to have pa.s.sed. These are chiefly to be found among the planetary nebulse, which in a small telescope exhibit a faint circular disc, but in larger instruments frequently show considerable varieties of structure. Some of them present the appearance of a condensation of light in the centre, which gradually fades off; in others there is a bright ring surrounding the central spot, but separated from it by a darker s.p.a.ce. The Nebula Andromeda 49647, [Footnote: The numbers are those given by Sir J. Hersohel.] as seen in Mr. La.s.sel's four-foot reflector appears as a luminous spot, surrounded by two luminous rings, which, in the more powerful instrument of Lord Bosse, combine into a spiral. Its spectrum is gaseous, with one line indicating some element unknown to us. In another nebula, Draco 4373, there is a double spectrum, the one gaseous, indicating the presence of hydrogen, nitrogen, and barium; the other, apparently from the nucleus, continuous, and so representing a solid or fluid ma.s.s, but so faint that the lines belonging to particular elements cannot be distinguished. [Footnote: Hugging, Philosophical Transactions, 1864.] Brida.n.u.s 846, and Andromeda 116, are probably similar nebulee occupying different positions with reference to us. They both give a continuous spectrum. The one in Brida.n.u.s is described as "an eleventh magnitude star, standing in the centre of a circular nebula, itself placed centrally on a larger and fainter circle of hazy light." [Footnote: La.s.sell, quoted in Webb's "Celestial Objects," p. 227.] The nebula in Andromeda a.s.sumes a lenticular form; that in Brida.n.u.s would probably present the same appearance if we saw it edge-ways. The former has probably increased in brilliancy in the course of centuries. Mr.

Webb remarks of it, "It is so plain to the naked eye that it is strange the ancients scarcely mention it." [Footnote: Webb's "Celestial Objects," p. 180.] In these two nebulas we may perhaps see the ma.s.s ready to break up into separate worlds, the lenticular form being a natural result of extremely rapid rotation. Prom the fact that Andromeda 116 gives a continuous spectrum, Dr. Huggins inclines to the belief that it is an unresolved star cl.u.s.ter. But the reasons which led Sir W. Herschel to conclude that the nebula in Orion was gaseous, (a conclusion which, though for a time discredited by the supposed resolution of the nebula in Lord Kosse's telescope, was ultimately found to be correct), are equally applicable here. In general a certain proportion exists between the telescopic power requisite to render a star cl.u.s.ter visible as a nebulous spot, and that which will resolve it into stars; but this nebula, like that in Orion, though visible to the naked eye, cannot be resolved by the most powerful instruments yet made. And the nebula in Draco 4373, seems to present an intermediate stage between the purely gaseous nebula and this one. The faint continuous spectrum is probably the result of incipient central condensation. This nebula, if recent observations by Mr. Gill, of Aberdeen, are confirmed [Footnote: Popular Science Review, 1871, p. 426.], is much nearer to us than any of the fixed stars.

"We come now to the reasons derived from the Solar System itself, and of these there are several, some of them of considerable weight. The first is to be found in the uniform direction of almost all the motions of the system. They are from west to east.

The sun rotates upon his axis, the planets revolve about the sun and rotate upon their axes, and the satellites, with one exception, revolve about their primaries, and, so far as is known, rotate upon their axes in the same direction, from west to east, and the motions take place very nearly in the same plane--the ecliptic. This seems to point to the conclusion that these motions have a common origin, as would be the case if all these bodies at one time existed as a single ma.s.s which revolved in the same direction. The one exception is to be found in the satellites of Ura.n.u.s, whose motion is retrograde. But there are certain phenomena, which lead to the conclusion, that, on the outskirts of our system, there has at some time or other been an action of a disturbing force, of which, except from these results, we know nothing."

[Footnote: Bode's "Law of Planetary Distances," What holds good as far as Ura.n.u.s, breaks down in the case of Neptune. Both Leverrier and Adams were to some extent misled by this law. The new planet should according to their calculations, based on this law, have been of greater magnitude and at a greater distance than Neptune.

The polar axis of Ura.n.u.s, instead of being nearly perpendicular to the ecliptic, as in the case of all the other planets (except Venus), is nearly coincident with it. Venus occupies an intermediate position, the inclination of its equator to its...o...b..t being 49 degrees 58'.]

There is also strong reason for believing that the sun is still a nebulous star, that the whole of the original nebula is not yet gathered up in the vast globe which at ordinary times is all that we can see. This aspect of the case, however, will come more fully under our notice when we come to the work of the fourth day. The figure of the earth, which is that naturally a.s.sumed by a plastic ma.s.s revolving about its axis, and the traces which it retains of a former state of intense heat, are both in accordance with this theory.

When these facts are duly weighed, there seems to be a reasonable probability that this process is the one which was actually employed in the formation of the solar system. The remarkable manner in which the theory adapts itself to the Mosaic account, and the fact that that account records special interferences of the Creator exactly at the points where the theory shows that such interferences would be necessary, give rise to a very strong presumption in its favour. We have in it also a clear ill.u.s.tration of the combination of general laws of nature with special interferences of Creative Power--the law of gravitation was called into action, and the work would proceed steadily under that law for a considerable period, till matters were ripe for a farther stage in the progress, and then the special interference would take place, in this instance the imparting the motion of rotation, and the work would again proceed under the natural law. All this while, however, the work would be one, and performed by one power, the only difference being in the direct or indirect action of that power.

The only point an reference to the first day which remains to be inquired into is the extent to which the work had proceeded at its close. As the commencement of the second day's work implies that at that time the earth had an independent existence, we may conclude that the first day's work comprehended the casting off of the several successive rings, and the condensation of those rings, or some of them, into the corresponding planets and satellites.

These would probably still retain their intense heat, in virtue of which they would be luminous.

Many of the multiple stars may not improbably present to us much the same appearance as the solar system then presented. In many cases we have one large star, with one or more very minute attendants. Such a star is Orionis, a tolerably conspicuous star, which has two companions invisible to the naked eye, but visible with moderate telescopic power. (A telescope of 2.1 inches aperture, by Cooke, shows them well.) Five more companions are visible in a 4-inch telescope. In the large telescope at Harvard no less than 35 minute stars have been seen in apparent connexion with the brilliant star Vega. In all these cases it is true that the distances and periods of the companion stars are very much greater than in the case of the earth; but then our telescopes will only enable us to discern the more distant companions. Any small companion stars holding positions corresponding to those of the four interior planets, would be lost in the light of the primary star; and if, as is suspected, all the heavenly bodies are subject to some resistance, however small, from the medium in which they move, this resistance would in the course of ages diminish the mean distance, and with it the periodic time of the companion stars.

The latter part of the 5th verse has already been considered, and there is no need to recur to it at this point. At the close of the history we shall be in a better position to ascertain if any light has been thrown on that mysterious subject.

SECTION 5. THE SECOND DAY.

"And G.o.d said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.

"And G.o.d made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament, and it was so.

"And G.o.d called the firmament Heaven, and there was evening and there was morning, a second day"

The work of the second and third days evidently has its scene on the earth alone. At its commencement the earth appears to have become distinctly separated from the gradually condensing ma.s.s of the solar system, and to have a.s.sumed its spherical form. It had, in fact, acquired an independent existence; but it was still in a chaotic state. Its elements, which were hereafter to a.s.sume the three forms of solid, fluid, and gas, seem to have been still blended together. Of the three states, fluidity seems to have been that to which the ma.s.s most nearly approached. This seems to be indicated by the application of the term, waters, to the two parts into which it is now divided; for the Hebrew has no general word for "fluid," so that the only method of expressing it was by the use of this word "water" in an extended signification; and all scientific investigations point to the same conclusion. The heat, as yet, must have been so intense that no rocks or metals with which we are acquainted could have remained in a solid form. The sorting out and first arrangement of the materials of the earth, with probably the farther development of a large portion of them by the introduction of a new element, seems to have been the work of the second day.

When we proceed to examine the narrative more closely, two important questions suggest themselves:--l. What special interference of Creative Power does it indicate? 2. What is the meaning of the division between the waters which were above the firmament and the waters which were under the firmament?

1. What special interference of Creative Power took place on the second day? Till within the last ten years, it would have been difficult to give a satisfactory answer to this question; for if all the elements were already in existence at the commencement of the second day, their arrangement would, as it seems, have been brought about by the ordinary operation of natural laws which were already established. The cooling and condensation of a portion of the elements would have been effected by the radiation of their heat, and the portions thus condensed would, under the influence of gravitation, have arranged themselves in immediate proximity to the centre of gravity, forming a solid or fluid nucleus, round which those portions which still remained in a gaseous state would have formed an atmospheric envelope. But here again the spectroscope comes to our aid. In many of the nebulae which give in it the bright lines indicative of gas, hydrogen and nitrogen are the chief gases discovered. These must be in an incandescent state, or they would not be visible at all. But hydrogen cannot, in the present state of things, remain in this condition in contact with oxygen; it must instantly combine with it, that combination being attended with intense heat, and resulting in the production of water. The introduction of oxygen, then, must involve a very important crisis in the process of development; but that introduction must have preceded the formation of atmospheric air and water. Prior to the second day oxygen must either have been non-existent, or it must have existed in a form and under conditions very different from those under which it exists now.

Free oxygen cannot be in existence in the sun or in any celestial object in which the spectroscope indicates the existence of incandescent hydrogen. The special act of the second day would appear to have consisted in the development of oxygen, or the calling it from a quiescent state into active operation.

But the effects of the new element thus called into operation would not be limited to the production of air and water. It is estimated that oxygen const.i.tutes, by weight, nearly half of the solid crust of the earth. It forms a part of every rock and of every metallic ore. The second day, then, must have been a period of intense chemical action, resulting from the introduction of this powerful agent.

But (2) what is the meaning of the division of the waters which are above the firmament from the waters which were under the firmament? At present all the water contained in the atmosphere, in the shape of vapour and clouds, is so insignificant in comparison with that vast volume of water which not only fills the ocean, but also permeates the solid earth, that such a notice of it seems unaccountable. Mr. Goodwin, indeed, maintains that there was an ancient belief, not only that the firmament was a solid vault, but that on it there rested another ocean, at least as copious as that with which we are acquainted. [Footnote: Essays and Reviews, p. 220] In support of this a.s.sertion he brings forward the phrase, "The windows of heaven were opened" (Gen, VII.

11) and other similar expressions. But such phrases as this evidently belong to the same cla.s.s as the fanciful names so often given to the clouds in the hymns of the Rig Veda. Both expressions evidently point to a time when figurative language, if no longer a necessity, was at all events a common and favourite form of speech, and was understood by all. Dr. Whewell [Footnote: Plurality of Worlds, chap. x. Section 5.] has put forward the curious notion that when the creation of the interior planets was completed, there remained a superfluity of water, which was gathered up into the four exterior planets. But the only fact in favour of such an hypothesis is the close correspondence between the apparent density of these planets and that of water. Now, as will be seen immediately, there is strong reason to believe that the true density of these planets is much greater than their apparent diameters would seem to indicate; so that the one solitary ground on which the suggestion rests vanishes when it is examined. Apart from this, however, the suggestion that there would be any superfluous material when the work of creation was finished, is a very strange one. Neither of these views, then, can be accepted as giving a satisfactory meaning to the text.

Astronomical investigations however, which have been carried on with great diligence during the last four winters, and which are still being continued with unremitting interest, have brought to light phenomena which seem to be in remarkable correspondence with the state of things spoken of in the text. It has already been noticed that the eight greater planets at present known to us are divided into two groups of four by the intervening belt of minor planets. These two groups have totally distinct characteristics.

In density, magnitude, and length, of day the members of each group differ little from each other, while the two groups differ very widely. The moon is the only satellite as yet known in the inner group. The planets of the outer group are attended by at least seventeen satellites.

Of these outer planets Jupiter, from his great brilliancy, specially attracts observation, while from his comparative proximity to the earth we are enabled to examine him much more satisfactorily than we can Saturn, Ura.n.u.s, or Neptune. Two facts with reference to him have long been well known, the one, that the polar compression in his case is much greater than it is in any of the interior planets, so that when seen through a telescope of very moderate power his disc is evidently elliptical, while the compression of the interior planets can only be detected by the most delicate micrometrical measurements--the other, that his apparent surface is always crossed by several alternating belts of light and shade, which though subject to constant changes of detail, always preserve the same general character. Until recently the generally received theory was that these belts consisted of clouds, raised by the heat of the sun, and arranged in zones under the influence of winds similar in character to, and produced by the same causes as, the trade-winds which blow over our own oceans. This view, however, has been shown by Mr. Proctor to be untenable. [Footnote: See a paper by Mr. Proctor in the Monthly Packet for October, 1870.]

About forty years ago, a very remarkable phenomenon was observed simultaneously, but independently, by three astronomers, Admiral Smyth, Mr. Maclean, and Mr. Pearson, who were watching a transit of Jupiter's second satellite from stations several miles apart.

Admiral Smyth's account of it is as follows:--"On Thursday, the 26th of June, 1828, the moon being nearly full, and the evening extremely fine, I was watching the second satellite of Jupiter as it gradually approached to transit the disc of the planet. My instrument was an excellent refractor of 3 3/4 inches aperture, and five feet focal length, with a power of one hundred. The satellite appeared in contact at about half-past ten, and for some minutes remained on the edge of the limb, presenting an appearance not unlike that of the lunar mountains which come into view during the first quarter of the moon, until it finally disappeared on the body of the planet. At least twelve or thirteen minutes must have elapsed when, accidentally turning to Jupiter again, I perceived the same satellite outside the disc. It was in the same position as to being above a line with the lower belt, where it remained distinctly visible for at least four minutes, and then suddenly vanished." A somewhat similar phenomenon, but of shorter duration, was witnessed by Messrs. Gorton and Wray, during an occultation of the same satellite, April 26, 1863. In this case the satellite reappeared after pa.s.sing behind the apparent disc of the planet.

So lately as 1868 this phenomenon was regarded as inexplicable.

[Footnote: Webb's Celestial Objects, p. 141.]

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