Narrative of the surveying voyages of His Majesty's ships Adventure and Beagle Part 18

This extremely sterile and barren country is very unfavourable for animals of any kind. The soil is like that already described about Port Desire. The rock is of the same character as at Port St. Elena and Port Desire: red porphyritic claystone.[116]

On the 23d of March, a week having pa.s.sed since we came to Port Desire, my anxiety for the Adelaide's safety was much increased; especially as both wind and weather had been favourable for her approach to this rendezvous. I therefore despatched Lieut. Wickham overland to Port Desire to order the Beagle to join us, and proceed with us to the other points of rendezvous, Port San Julian and Cape Fairweather. Lieut. Wickham reached Port Desire after a fatiguing walk, and early next morning the Beagle was beating into Sea Bear Bay against a very strong wind which increased, and detained us. I seized this opportunity of completing our consort's provisions to five months. Captain Fitz Roy informed me that he had taken advantage of his stay at Port Desire, to ascend the inlet to the head. It extended for thirty miles, and the water was salt to its very extremity; but, from the height of the old banks on each side, it appeared likely that at times there may be considerable freshes. At the head of the river he lighted a fire, {196} which spread, and soon joined that which Mr. Tarn had made.

Their union probably burned many square leagues of country.

On the 27th, we were still detained by a southerly gale. Captain Fitz Roy accompanied me in search of Indian graves, which are described to be on the summits of the hills. We found the remains of two, one of which had been recently disturbed, but the other had been opened a considerable time.

No vestiges of bones were left. It is said that the corpse is extended in an east and west direction, on the top of the highest pinnacle of the hill, and then covered over with large stones until secure from beasts of prey.

Decomposition takes place, or the flesh is consumed by small animals or insects, without the bones being removed, so that complete skeletons are formed. According to Falkner, the bones are collected at a certain period, and removed to some general cemetery, where the skeletons are set up, and tricked out with all the finery the Indians can collect. The avidity they evince for beads and other ornamental trifles is, perhaps, caused by this desire of adorning the remains of their ancestors.

The next morning we left Sea Bear Bay and proceeded to San Julian, off which we anch.o.r.ed for a few hours, while Captain Fitz Roy entered the port to look for the Adelaide, or for some vestige of Lieutenant Graves's visit.

Finding nothing in the port, nor any tracks upon the sh.o.r.e, we went on towards Cape Fairweather, and in our way met the Adelaide. After parting from us during the gale in which all her sails were split, she went to Port Desire, where she arrived first, and, not seeing us, proceeded to the two other places of rendezvous, and had been lying at anchor eight days off Cape Fairweather. Finding we were not there, she was returning to Port San Julian, when we met her.

The weather being calm, so good an opportunity of supplying the Adelaide with provisions was not lost, and she was completed to six months.

On the 1st of April we were off Cape Virgins, and parted from the Beagle and Adelaide; Captain Fitz Roy having previously received orders from me to proceed through the Strait of Magalhaens, and despatch the Adelaide to survey the {197} Magdalen and Barbara Channels, while he was to survey part of the south sh.o.r.e of the Strait and the Jerome Channel, and then proceed, in company with the Adelaide, to Chiloe.

The Adventure then proceeded along the coast of Tierra del Fuego towards Staten Land, for the purpose of communicating with the Chanticleer, or obtaining some intelligence of her. The appointed rendezvous was New Year's Harbour, and the day on which I had promised to be there was past.

It was so foggy that no part of the coast of Tierra del Fuego could be seen; but as any detention might cause Captain Foster inconvenience, I did not wait for fair weather, but went at once to the place appointed.

When crossing Strait le Maire, we were very nearly drifted through by the tide, which, however, changed just in time to admit of our keeping on the north side of Staten Land.

With a strong squally breeze we entered New Year's Harbour, and seeing nothing of the Chanticleer, should have sailed without further investigation, had we not observed a cleared white s.p.a.ce on one of the islands, which being near the place where I had requested Captain Foster to leave a doc.u.ment, I concluded was intended to attract our attention. The anchor was therefore dropped in twenty-five fathoms (the island bearing from N. to N.W. W.), nearly in the spot where Captain Cook anch.o.r.ed, and a boat was sent to the white mark, near which a flag-staff was observed, at whose foot was a tin canister, containing a letter from Captain Foster, which informed me of his having been obliged, in consequence of a longer detention here than he had antic.i.p.ated, to alter his arrangements, and requesting me to meet him at St. Martin's Cove, near Cape Horn, about this day. We therefore lost no time in getting under weigh, but in doing so, broke an anchor. We pa.s.sed round Cape St. John, and with a fair wind made rapid progress to the westward. At noon, the next day, being seventy-five miles from Cape Horn, bearing W. by S., the high mountains on the S.E. end of Tierra del Fuego came in sight, among which the 'Sugar Loaf'(g) was a conspicuous object. {198} By an angular measurement of its alt.i.tude, and the distance given by the chart, its height must be nearly five thousand feet, and the average height of its neighbouring mountains full three thousand.

A south-west gale now set in, and delayed our reaching Cape Horn until the 16th, when we anch.o.r.ed off the entrance of St. Martin's Cove and found the Chanticleer moored within. A boat soon after came with the welcome information of all being well on board her. We were not able to warp into the Cove until next day, and in doing so found much difficulty, owing to the violence of the squalls, which repeatedly obliged us to slacken the hawsers quickly, else we should have carried them away.

The Adventure was moored in seventeen fathoms, about a cable's length within the low green point on the south side: and the Chanticleer lay in ten fathoms near the head of the Cove. The summit of Cape Horn being in a line with the south point of entrance, we were quite land-locked, and perfectly sheltered from all winds, excepting the williwaws, or furious gusts from off the high land, which sometimes suddenly struck the s.h.i.+p, and threw her on her broadside; but being as momentary in duration as they were sudden in approach, we found them more disagreeable than dangerous.

During our stay here I made a partial survey of the Bay of St. Francis, which has since been completed by Captain Fitz Roy. St. Joachim's Cove, to the southward of St. Martin's Cove, is more exposed than the latter, but is of easier depth. These coves are separated from each other by a steep and precipitous ma.s.s of hills of greenstone, which in many parts appear to be stratified, the dip being to the westward, at an angle of 40. I landed at the point, and ascended the hill, which I found more difficult to do than I supposed, the whole surface being covered with stunted beech bushes, so thickly matted or interwoven together, that I was obliged to walk or crawl over their tops. Among them were occasionally seen the berberis ilicifolia and veronica, the latter of very small size. Another day, Lieutenant Kendall, of the Chanticleer, accompanied me {199} to Weddel's Port Maxwell, which is evidently St. Bernard's Cove of D'Arquistade.(h) Port Maxwell is contained between Jerdan Island, Saddle Island, and a third island, forming a triangle. It has four entrances, the princ.i.p.al one being to the north of Jerdan Island, and affords tolerable anchorage in the centre, in nineteen and twenty fathoms, sand;[117] nearer the sh.o.r.es of the island the depth is more moderate, but the bottom is very rocky.

The summit of Saddle Island, which I ascended for bearings, is composed of large blocks of greenstone rock, on one of which the compa.s.s (Kater's Azimuth, without a stand) was placed; but the needle was found to be so much influenced by the ferruginous nature of the rock, composed of quartz and feldspar, thickly studded with large crystals of hornblende, that the poles of the needle became exactly reversed. An experiment was then made, by taking bearings of a very distant object, at several stations around, about fifty yards from the magnetic rock, when the extreme difference of the results amounted to 127. The block upon which the compa.s.s stood, in the first instance, is now conspicuously placed in the museum of the Geological Society.[118]

Saddle Island, like the others near it, is clothed with low stunted brushwood of beech, berberis, and arbutus, and the ground is covered with a species of chamitis, and other mountain plants. While Mr. Kendall and I were absent from the boat, the crew caught several kelp fish, which are very delicate and wholesome food. On the following day, while going with Mr. Kendall to Wollaston Island, we pa.s.sed a great many whales, leaping and tumbling in the water. A blow from one {200} of them would have destroyed our boat, and I was glad to cross the Sound without getting within their reach. We returned by the west side of Jerdan Island, where there are bights which might afford shelter to a small vessel.

The Sound that separates Wollaston Island from the Bay of St. Francis, I named after Sir John Franklin, and the harbour to the east of the point on which we landed, after Lieutenant Kendall, who was one of Sir John Franklin's companions in his last journey to the north-west coast of America.

On the west point of Kendall Harbour, I observed a magnetic property in the rock, which is of the same character as that on Saddle Island. Weddel noticed the same at St. Martin's Cove; but I placed the compa.s.s in various parts of that cove, without observing any difference from the correct bearing. This was, perhaps, owing to the rock being much covered with soil; for, being of the same character with that of the places above-mentioned, it should cause a similar effect.

The next day S.W. gales and thick weather set in, and confined us almost to the s.h.i.+p. Taking advantage of a short interval of more moderate weather, I ascended the highest peak on the south side of the cove, immediately over the anchorage, taking two barometers, one of the Englefield construction, and the other a syphon barometer, on M. Gay Lussac's plan, made by Bunten, of Paris. Mr. Harrison accompanied me, taking charge of one barometer, whilst I carried the other. My c.o.xswain carried a theodolite. On landing, the barometers were set up at the edge of the water and read off, and at the same moment the barometer on board was read off. We then ascended, but the rise was so precipitously steep as to offer very great impediments; and had it not been for a water-course, in whose bed we climbed for the first part, the ascent, with delicate instruments, would have been almost impracticable. We had ascended but little way, when the unfortunate theodolite escaped from my c.o.xswain, rolled down the ravine, and was much damaged. It was an excellent magnetic transit, and for that purpose was irremediably injured; but, as a theodolite, it was yet useful. The first third of the ascent, from the {201} comparative facility offered by the water-course, was only impeded by loose stones, which frequently yielded to the foot, and rolled down the gully, to the great danger of those who followed. The banks of the ravine were saturated with water, and covered either with spongy moss, or matted with plants,[119] which afforded no a.s.sistance; had it not therefore been for straggling shrubs of arbutus, or veronica, and tufts of rushes, growing on the steeper parts, we should have had many a fall; and however unimportant we might think bruises and scratches, a broken barometer would have been a serious accident, and much care was required to avoid it. We had to leave the bed of the torrent, when it became full of wood, and then our difficulty increased much; for in many places we had to scramble over the thickly-matted and interwoven branches of the stunted bushes of beech which frequently yielded to our weight, and entangled our legs so much, that it was no easy matter to extricate ourselves.

At the height of one thousand feet, vegetation became much more stunted; we found the plants and shrubs of very diminutive size, consisting princ.i.p.ally of the deciduous-leaved beech, one plant of which, though not more than two inches high, occupied a s.p.a.ce of four or five feet in diameter, its spreading branches insinuating themselves among wild cranberry, chamitis, donacia, arbutus, and escalonia, so closely matted together, as to form quite an elastic carpet. For the last two hundred feet, we walked over the bare rock, on which no other vegetation was observed than lichens. The summit of the peak is formed by a loose pile of green-stone rock, in which the hornblende appears in very varied forms, sometimes in large crystals, and again so small and disseminated, as to be scarcely visible; on the summit it is seen, in very long, narrow (? filiform) crystals, and the feldspar predominating, gives it a white appearance.[120]

The only living creatures we saw were a solitary hawk and {202} one insect, a species of Oniscus. Nothing, in fact, could be more desolate, and we had only the satisfaction of a good observation for the height, and an excellent bird's-eye view of the surrounding islands and channel, to repay us for the labour of the ascent. On reaching the top, the barometers were suspended under the lee of the rock, twelve feet below its summit, and I then proceeded to set up the theodolite, which I found more damaged than I had antic.i.p.ated; but not so much as to deprive me of a very extensive round of angles, in which were contained bearings of the Ildefonso Islands. We were thus occupied about an hour and half, which afforded me an opportunity of obtaining two good readings of the barometer.

The view to the N.W. was very extensive, and bounded by long ranges of snow-clad mountains of great height; the atmosphere was remarkably clear, and every object unusually distinct. Bearings of the islands of Diego Ramirez would have been taken, but for the extreme force of the wind, which more than once blew me from the theodolite, and once actually threw me on the ground. The temperature was not below 38; but, owing to the wind, the cold was intense, and the rapid evaporation produced the most painful sensations, particularly in our feet and legs, which were thoroughly wet when we reached the top.

Our descent was not effected in less than an hour and twenty minutes, owing to the difficulty of pa.s.sing through the beech thickets; but we reached the base without injury to the barometers, which was being more fortunate than I expected. They were again set up on the beach, and read; after which we returned on board, amply gratified and rewarded for our fatigue.

The height of the peak, which, from its vicinity to the station selected by Captain Foster for the pendulum experiments, could not receive a more appropriate name than Kater's Peak, was found to be 1,742 feet above the high-water mark.[121]

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The next day, after a beautifully clear and mild morning, with a fresh northerly breeze, the weather became cloudy, and the wind veered to the S.W. blowing excessively hard, with hail and rain. The gusts, or williwaws, rushed through the valley of the cove with inconceivable violence, heaving the s.h.i.+p over on her broadside every minute, so that we were obliged to have every thing lashed as if at sea. Fortunately, we had completed wood and water, and now only waited for observations, to rate the chronometers, for our run to Valparaiso, whither it was my intention to proceed. Days, however, pa.s.sed without a glimpse of the stars, and the sun only appeared for a few minutes above the hills. Captain Foster had completed his observations, and embarked all his instruments, excepting the transit, which remained for taking the pa.s.sages of stars; but the bad weather continued, with little intermission. On the 3d, the gale was most violent, and the williwaws became short hurricanes, in some of which the s.h.i.+p drifted and fouled her anchors. On the 10th, we had a dry and fair day, which permitted us to sight the anchors and moor again.

The fine weather was of only a few hours duration, when the gale again sprung up, and lasted, with little intermission, until the day of our departure (the 24th). From the 4th to the 22d the sky was so perpetually clouded, that the only transits obtained in that interval were, one of Antares, one of Regulus, and one of the limb of the moon, though Captain Foster even slept close to the telescope, in the greatest anxiety to obtain observations. On the night of the 22d four stars were {204} observed, by which the error of the clock was satisfactorily ascertained.

Captain Foster's pluviameter, a cubic foot in size, placed on a stand two feet above the ground, at an elevation of forty-five feet above the sea, contained eight inches and a quarter of rain, after standing thirty days; therefore, with the quant.i.ty evaporated, at least twelve inches must have fallen. The day after the above was registered, the vessel only contained seven inches and a quarter; so that in twenty-four hours one inch had evaporated, by which an idea may be formed of the sort of weather we experienced, and of the humidity of the climate.

With respect to the geological features, I can only add, that all the islands on which I landed, and, I believe, all the others, are composed of green-stone of various characters. The lower portion, or base, being less decomposed, is a fine-grained green-coloured rock, in which the component parts are so blended as not to be distinguished from each other. It appears sometimes in strata, dipping at various angles, from 20 to 45 from the vertical; and is very similar to the rock which alternates with granite in the Straits of Magalhaens, at the entrance of the Barbara; and also to that about Pond Harbour, and Bell Bay. At a greater elevation the feldspar predominates, the hornblende is observed in distinct crystals,[122] and the rock contains a considerable quant.i.ty of iron, which is observed in the reddish tinge of its surface. I have before noticed the magnetic property of this rock, which was more or less according to the quant.i.ty of hornblende: the beach-stones are different sorts of green-stone.

The lower parts of the hills, around St. Martin's Cove, are thickly wooded with the smooth-leaved, evergreen beech, which I have before described. Its leaves were as fresh and vivid, when we sailed, as if it were the height of summer; but those of the deciduous-leaved beech had a.s.sumed their autumnal tint, and were falling fast. Neither species attained a greater size, in diameter, than six or eight inches. The Winter's-bark was {205} found in sheltered places, but not larger in dimensions than the beech.[123] Where no trees are produced, the ground is covered with tufts of chamitis and donacia, which, being of a bright-green colour, give the sides of the hills a lively and verdant appearance. Had the state of the weather permitted our boats to leave the neighbourhood of the cove, or had the woods afforded any addition to collections for natural history, our detention would have been more agreeable; but, with the exception of a few corvorants, divers, and 'steamers,' with now and then a solitary hawk, or a Patagonian 'warbler,'

we saw no traces of animal life. No Indians came near us, having been frightened away by the Chanticleer; for when Captain Foster was absent at night, after attempting to land at Cape Horn, several rockets were fired off as signals, and a few Indians who were then in the cove were so much alarmed, that they went away next day, and never afterwards showed themselves, although I dare say we were very narrowly watched by them.

Having supplied the Chanticleer with the provisions she required, we prepared to leave St. Martin's Cove. On the 24th the Chanticleer sailed, and in two hours after we also left this dismal cove, in which we experienced a succession of very bad weather, an almost constant S.W. wind, and for the last month a scarcely ceasing fall of either rain, hail, or snow. The Chanticleer bore away round Cape Horn, and was soon out of sight.

This was my last meeting with Captain Foster, who, the night before we sailed, communicated to me a presentiment, which he could not shake off, that he should not survive the voyage. I cannot now resist indulging in the melancholy satisfaction of saying a few words to the memory of my late excellent {206} friend, and lamenting, with many others, the severe loss which science suffered in his death. He was a fellow of the Royal, and Astronomical Societies, and to the former had contributed, to use the words of His Royal Highness the Duke of Suss.e.x, as President of the Royal Society, a most valuable and extensive series of observations upon the diurnal variation, diurnal intensity, and dip of the magnetic needle; and upon other subjects connected with the terrestrial magnetism and astronomical refraction, which formed an entire fourth part of the Philosophical Transactions for the year 1826. For these papers he received the Copley medal; and the Lords of the Admiralty acknowledged their sense of the honour which was thus conferred upon the profession to which he belonged, by immediately raising him to the rank of Commander, and by appointing him to the command of the Chanticleer, upon a voyage of discovery and observation in the South Seas. The address of the President of the Royal Astronomical Society, at the anniversary meeting,[124] also bears ample testimony to his active and useful services in the expedition, under Captain Parry, towards the North Pole; as well as to his ardent zeal, very great attention, and accuracy, in every thing which he undertook for the promotion of science; and concludes the notice of his death in the following words: "In the premature death of this young and accomplished officer, the Society has to deplore the loss of a zealous and active votary to science; and his memory will be long held dear by those who were more intimately acquainted with him in the relations of private life." Captain Foster was unfortunately drowned, near the close of his voyage, while descending the River Chagres in a canoe.

No sooner had we cleared the land, than we found a strong westerly wind, and a heavy sea; so that if we had entertained any expectation of making a quiet pa.s.sage to the westward, we should have been disappointed.

The land of Hermite Island, and its vicinity, has a most remarkable appearance when seen from the south. Its outline is a series of peaks, following each other in regular succession, {207} and resembling the worn teeth of an old saw. Mount Hyde is made sufficiently distinct by its rounded apex, and by being higher than any land near it. Kater's Peak also is remarkable in this view, from its conical form and very pointed summit, and from being situated at the eastern end of the island. The 'Horn' itself needs no description; it cannot easily be mistaken.[125]

Westerly winds carried us as far as 60 south lat.i.tude before we could make any westing, and then we had a slant from the eastward, followed by variable winds. Our run to Valparaiso was much like all other voyages in this climate; we had the usual quant.i.ty of foul and fair winds, with a share of tempestuous weather, and arrived at Valparaiso Bay on the 22d of June. While remaining here our chronometers were cleaned, and some of them repaired; and the s.h.i.+p was refitted and provisioned, with a full supply for the Beagle and Adelaide as well as herself.

At the latter end of July, Lieutenant Wickham accompanied me to Santiago, the capital of Chile, ninety miles from the port, for the purpose of waiting upon General Pinto, the Director; and communicating to him the purpose of our voyage, to prevent exciting suspicion, or receiving any interruption on the part of the authorities of places we might visit, particularly Chiloe, where our stay might be viewed with distrust or apprehension; for rumour had already said that the English were about to take that island. Ridiculous as such a report was, I deemed it sufficiently important to induce me to explain to the Chilian Government our views and orders, which could be done better by personal explanation than by a correspondence.

We commenced our journey early on the 11th of July, travelling in a covered chaise, drawn by three horses, one in {208} the shafts, and the others outside, attached to the carriage by a single trace of hide; and preceded by a drove of horses, from which, at the end of every stage of twelve or fifteen miles, we selected a relay. The day was so very stormy, that we saw but little of the country. Immediately after leaving the Almendral, or suburbs of Valparaiso, we ascended twelve hundred feet, and then descended about four hundred feet to an extensive plain, reaching to the Cuesta de Zapato, the summit of which, at least the highest part of the road over it, we found by barometrical measurement to be 1,977 feet above the sea. In the interval we pa.s.sed through the village of Casa Blanca, lying eight hundred and three feet above the sea. After pa.s.sing the Cuesta de Zapato, between it and the Cuesta de Prado, is another extensive valley, through which runs the River Poangui. At Curacavi, where we crossed the river, the height above the sea is six hundred and thirty-three feet;[126] and the road proceeds by a gentle ascent to the foot of the Cuesta de Prado, near which is the village of Bustamente, eight hundred and eight feet above the sea.

This 'cuesta' is pa.s.sed by a very steep road, and is ascended by twenty-seven traverses, which carry one to a height of 2,100 feet above the plain, or 2,950 feet above the sea. When we reached the summit of this mountain the weather was so cloudy, that the Andes were almost concealed from view. Beneath us was the extensive plain of Maypo, with the city of Santiago in the distance, a view of considerable extent, and possessing very great interest; but from the state of the weather, its beauty would not have been seen to advantage, had not portions of the towering Andes, raised by optical deception to apparently twice their height, appeared at intervals among the clouds. On {209} a fine day, when the range of mountains is uncovered, the view is grand; but not so imposing as when their lower portions are concealed, and their summits partially exposed.

This part of the Andes rises about 11,000 feet above the plain, and is covered half way down the sides with snow, the lower edge of which is regularly defined, and presents a change of colour so abrupt and horizontal as to appear unnatural, and therefore diminish the grandeur of the scene very much. But under whatever circ.u.mstances this view is seen from the Cuesta de Prado, it is magnificent, and produces an effect beyond description. The road descends down the eastern side of this Cuesta, to a plain about 1,100 feet below the summit. So much rain had fallen during the two preceding days, and last night, that our driver expressed some doubt whether we should be able to cross the Podaguel, a river which is frequently impa.s.sable from the strength of its current. The idea of spending a night at the miserable hovel we were leaving was enough to induce us to run a considerable risk, and we set off to make the attempt.

The water was very deep, and the current sufficiently strong to render it a performance of some danger; but, this difficulty being pa.s.sed, we soon reached the city of Santiago, and in the house of Mr. Caldcleugh, enjoyed the hospitality and society of a warm-hearted friend.

I waited on the Director (Pinto), who received me with the greatest politeness. He entered into the particulars of our past voyage with much interest, a.s.suring me that every facility should be afforded, and every a.s.sistance rendered, whenever it might be required; and in this a.s.surance we never found ourselves deceived, for on all occasions the conduct of the executive authorities towards us was marked in attention, and even kindness. I make this observation with the more pleasure, as it was very unusual in our communications with the authorities of those governments we had previously visited, to find the objects of our voyage considered in the least interesting.

Although the weather, during our visit to Santiago, was not there considered fine, we left the city and its neighbourhood with a strong impression of the salubrity of the climate, and the {210} mildness of its temperature, which even in the middle of winter, and at the height of nearly 2,000 feet above the sea, ranged no lower than 45 Fahrenheit, and during the day the maximum height of the thermometer never exceeded 62.[127](k)

We returned to Valparaiso on the 26th of July, and made preparations to sail; but were detained by a strong northerly gale for many days, in which we were enabled to render a.s.sistance to a large Indian trader that would otherwise have been wrecked. On the 10th of August, we sailed for Chiloe; and on our way were greatly delayed by southerly winds, which carried us in sight of the island of Juan Fernandez. We reached our destination on the 26th, and found the Beagle, to our great delight, arrived, and all well.

Captain Fitz Roy came on board before we anch.o.r.ed, and gave me an outline of his proceedings, and those of the Adelaide, which had not {211} returned, but was daily expected, having been despatched to survey some interior channels on her way to Chiloe. Our anchorage was off Point Arenas, which is not only the best in the bay, but appeared to be well adapted to our wants. The Beagle had arrived early in July, and had sent to Valparaiso for stores with which to refit, and make preparations for another cruize to the south.

The harbour master, Mr. Williams, an Englishman, visited us soon after our anchoring, and by him I forwarded to the Yntendente (or governor), Don Jose Santiago Aldunate, the letters brought for him from Chile.

In the afternoon I received his acknowledgments, and offers of all the a.s.sistance in his power to render. As it was probable that our stay would occupy some weeks, I established myself at a house in the town, obtained by his kindness; and there fixed my portable observatory, and set up an azimuth alt.i.tude instrument.

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CHAPTER XIII.