Practical Taxidermy Part 33

In a highly interesting paper in the "Country," of 2nd Oct, 1873, Dr.

Guard Knaggs gave a very full account of the theory and practice of "a.s.sembling," so interesting, indeed, that I venture to reproduce it in extenso. He says:

"The generally accepted theory is that each female should, at one or other period of her existence, captivate at least one of the opposite s.e.x, though it will be found by experience that some species possess a far more potent influence for this purpose than others.

"It may be set down as a rule that females which are captured at rest during the time of day or night at which they should naturally be upon the wing are unimpregnated, and may be used for attracting with fair chances of success. There may be exceptions to this rule; my opinion inclines to the belief that the b.u.t.terflies take wing before impregnation; but of this I am certain, namely, that the females of b.u.t.terflies--at any rate of certain species--have considerable influence over the males.

Doubtless, too, there are many skittish Geometrae or slender-bodied moths, and Pyrales, or Pearls, which are easily frightened, the females of which will rush from their places of concealment even before they are prepared to start on the mission of ovipositing. The converse of this rule, that female insects captured on the wing are almost invariably impregnated, may be taken as an axiom, at least so far as the moth tribe is concerned.

Of course females which have made their appearance in our breeding cages are the most eligible for the purpose of attraction; but whenever we breed these with the intention of using them for attracting, we must bear well in mind that the rearing process, whether from the chrysalis, the caterpillar, or the egg, must be conducted under surrounding conditions of temperature, etc, as nearly as possible resembling those to which they would be subjected in their natural state. Otherwise, if we r.e.t.a.r.d their appearance by keeping our breeding-cages in too cool a situation, we shall be too late for our sport, or at best capture only worn specimens; while, if we force them by an unnatural state of warmth, the males will not have made their appearance at large by the time we are ready to arrive upon the hunting-ground.

Having furnished ourselves with a bred female, the next procedure will be to construct a cage for her reception in such a manner that the males will be compelled to keep within a respectful distance, and formed of such material as will permit the air to readily permeate the sides of the prison.

Fig. 55--a.s.sembling cage.

The cage (Fig. 55) adapted to our requirements is a very simple affair; it is formed by bending our three strips of cane of about equal lengths each into the form of a circle, and fixing them in that form by means of twine; these three circular pieces are then placed in such a manner that they cross one another at right angles (Fig. 55), thereby forming the rudimentary outline of a hollow sphere, over which it is an easy matter to stretch and tie a piece of leno. When required for use the female may be put in, either loose or clinging to a twig of the length of the diameter of the globe, and the leno tied afterwards.

"The theory of the peculiar action of the female upon the senses of the males is usually considered to be due to a subtle scent which emanates from her, and is wafted on the breeze to distant parts; and it is believed that by means of this scented track the males are enabled to discover the whereabouts of the object of their search. And that this would appear to be the true solution, no one who has witnessed the grand spectacle of the 'Kentish Glories' or the 'Emperor' moths coming up against the wind can, I should say, for a moment doubt.

"To be attractive the female must be in that condition which is known by the fraternity as 'calling,' that is, she should be slightly convulsed with tremor, and the last segment of the body should be denuded of fur. Then, if the weather be propitious--bright for such males as fly in the suns.h.i.+ne, warm at dusk for those whose hour of flight commences with the shades of evening--and if also the wind be blowing steadily from a favourable quarter, such as west, south, or a gentle south-west, we may reasonably hope for success.

"But the young collector must remember that it does not by any means follow that because he captures a female, say an 'Oak eggar,' on the wing in the evening, he has detected the time of flight of the males.

In fact, it very frequently happens that the males fly in the daytime and the females in the evening.

"In the case of species which inhabit open parts of the country, such as moors, mosses, commons, chases, fens, and fields, we should take care that no obstacle is in the way to prevent the current of air from carrying the scent freely over the locality. On the other hand, if it be the inmates of a wood or copse which we are desirous of attracting, we must either select a ride down which the wind finds its way, or else we shall have to allow the breeze to convey the scent from some part of the surrounding country to the outskirts of the wood.

"As a rule, it is quite sufficient for our ends to lay the baited cage upon the ground, and then to lie down at a little distance off and keep watch. But in some cases it is advisable to tie the cage to the trunk or branch of a tree, or to fix it in a bush. I have found the latter very effective with the red-belted apple clearwing (Sesia myopiformis), and no doubt it would also prove so with other species of the cla.s.s.

"Any Londoner who would like to judge for himself can easily manage it. He has only, in the first place, to hunt about in his own or some one else's garden for a handsome little caterpillar, of a blackish colour, spotted with pink, with four rows of thick tufts of yellowish hairs resembling brushes upon its back, with two long tufts of blackish hairs pointing forwards in front, almost like horns, and a similar one behind pointing backwards, something like a tail. It eats almost anything, and is easily reared.

When full fed it spins a web, in which it changes to a chrysalis; and, in time, from some of the coc.o.o.ns thus formed, spider-like creatures will emerge and attach themselves to the outer part of the web. These should at once be removed (web and all), and placed securely in the cage already mentioned, when, if there be any males about, I will warrant it will not be long before the proprietor has a very tolerable idea of what is meant by attracting by the bred female."

COLLECTING AND REARING LARVAE.--Very many insects are more easily collected in the larval or caterpillar stage than in the perfect one.

Every tree, bush, or plant, the gra.s.s, and even the lichens growing on trees or walls, produce some larvae feeding on it. It would, I feel, be a work of supererogation to attempt to give detailed descriptions of food-plants and the insects feeding on them, when we have a book so good and cheap to fall back on as "Merrin's Lepidopterist's Calendar,"

which gives the times of appearance of b.u.t.terflies and moths in all their stages, with localities and the food-plants of the larvae, and this for every month of the year.

For bringing caterpillars home, a larvae box is necessary; this should, if possible, be made of a cylinder of wire gauze or perforated zinc (see Fig. 56), capped top and bottom with zinc, the bottom a fixture, the top to lift off, dished inward towards an orifice with a tube soldered in it, which is kept corked until it is wanted to drop larvae down it. The tube coming well through into the cylinder, and narrowing inside to half its diameter at the top, prevents anything escaping, even if the cork should be left out, and also prevents the swarming out of the enclosed larvae, which would take place if the top were lifted off bodily.

Wooden canisters, such as tobacco is often stored in, make very good subst.i.tutes if small holes are bored in the side. Tin canisters, or, indeed, anything made entirely of metal, unless plenty of ventilation is afforded, as in Fig. 56, have a tendency to cause the enclosed larvae to sweat.

Some few hints as to collecting larvae may not be unacceptable. In the spring, just as the buds of various low plants and bushes break forth, they should be searched by night, by the aid of a lantern, for the larvae of various noctuae and geometrae then feeding. The best plants to search will be the mountain ash, bilberry, honeysuckle, and bramble, given in their order of merit. Many other plants may be advantageously searched, in fact, all low plants and bushes ought to be well looked over by the persevering collector.

Later on, sweeping, i.e, pus.h.i.+ng a strong ring net through the gra.s.s, may be resorted to. The net for this should be made of strong wire in the shape of the net at Fig. 46, or 43, if without the joints, a bag of strong dowlas and a stick are attached, and the front square-ended part is pushed by the collector through the gra.s.s, in order to trap any low feeding or invisible insects. When the leaves are fully out on the trees, beating will shake many larvae, pupae, certain moths, beetles, etc, into the net or sheet spread to receive them, Both sweeping and beating may be practised by night as by day.

The situations in which larvae are found are many, some rolling themselves in nettle, oak, or other leaves; others boring into the substance of the wood itself, and some feeding in the stems of various bushes, plants, reeds, etc. For life histories of such consult the pages of the Entomologist's Monthly Magazine, or Entomologist, both published every month at 6d. each; or Newman's "British b.u.t.terflies"

and "British Moths," published as complete volumes at. 7s. 6d. and 20s. respectively. These latter are the finest works at the price in any language whatever, giving figures--perfect specimens of the wood engraver's art--of the whole of the Macro-Lepidoptera, backed up by exhaustive descriptions.

Fig. 56--Cage for collecting larvae.

"Digging" in the dead months of the year, when the weather is mild, for pupae, is another method of getting insects. Corners where roots meet or spring from the trunks of trees, are good "harbours of refuge"

for pupae; so are inner angles of walls, underneath sheltered hedgerows, or under isolated trees in parks or meadows, and a host of other spots.

The best places for "digging" are not always, as you would suppose, in the thickest parts of woods or shrubberies, but under skirting trees or in avenues. The best times for pupae are from October to January.

Many people attain great proficiency in finding--the Rev. Joseph Greene, to wit. For my own part I must confess that I have never "earned my salt" at it, but that is possibly due to want of skill or perseverance.

The tools required are simply a trowel, a curved piece of steel fitted in a handle, or a three-cornered instrument similar to, but smaller than, the sc.r.a.per used by s.h.i.+pwrights; anything, in fact, handy to carry, and efficacious in scratching up the sod at the roots of trees, or tearing off the pseudo-knots of bark which veil the pupae of various moths.

When larvae or pupae are brought home, it will be necessary to place them in something which, though retaining them in captivity, yet allows them as natural conditions of living as is possible in a circ.u.mscribed s.p.a.ce. Pupae, may be kept in a flower pot covered with earth, or in moss damped from time to time with water of not too cold a temperature. Over the flower pot may be strained two pieces of wire or cane, crossing each other in the form of arches, the whole covered with muslin; or a handier plan to get to the insects quickly when emerged, or to damp the pupae, is to procure from the gla.s.s merchant the waste cylinders of gla.s.s cut from shades, pasting over one end with "leno" or muslin, and placing the other in the flower pot on top of the earth or moss.

This also makes a cheap subst.i.tute for the breeding cage for larvae, if a little earth only is put in the flower pot in which a bottle of water is placed containing the food plant. Wire gauze cylinders are handy as affording plenty of air to delicate larvae. Bandboxes with a square piece cut out from the top lid, the hole thus made covered with muslin, will do very well for breeding a quant.i.ty of a hardy common sort.

Fig. 57--Insect breeding cage

The usual wooden breeding cage is shown at Fig. 57. This requires hardly any explanation: A is a gla.s.s door, B B B are sides and top of perforated zinc, C is a tray fitting inside, where dotted lines are shown, to hold the earth in which the bottle of water holding food is placed, or where the larvae bury themselves to change to pupae.

Properly, the inner tray of box C should be constructed of zinc perforated with a few holes at the bottom, in order that it may be lifted out to allow the pupae to be well damped when "forcing."

[Footnote: For those larvae of b.u.t.terflies and moths which do not require earth, it will be sufficient to have a zinc pan, with covered top perforated with holes, in which the stalks of the food plants be inserted in the water which fills the pan, whose covering prevents the insects from drowning themselves therein.]

"Forcing" is a method adopted to cause any moth to emerge at the collector's will, and several months before its proper time, it having been proved that certain moths more than others die in the chrysalis or pupa state if left to go their full time, notably the "Death's Head," the "Spurge," and other hawks. The best time for forcing is about Christmas, and the conditions are simply heat and moisture, the pupae being placed over a spirit lamp, in a hothouse, on the kitchen mantelpiece, or by the fire grate even, kept for a week or so at a temperature of 85 deg. or thereabout, and constantly damped with moss wrung out in warm water. Bear in mind that heat without moisture will not do by any means.

The breeding cage itself need not be used, but only the tray, provided that gauze is stretched over in such a manner as to allow room for the moth to dry its wings on emergence. But if the whole of the breeding cage were made of framed zinc (such as aquaria are made of), and the gla.s.s and perforated zinc fixed in, the cost, though greater at first, would be more than counterbalanced by its greater strength, with lightness and capability of resisting wear and tear, added to which is the advantage of being used as a whole during the operation of "forcing," wood not standing, of course, the heat and moisture necessary. Breeding cages should not be painted.

Fresh food, and plenty of it, should, if possible, be supplied to the larvae. Dry food is, as a rule, the best, though the larvae of one or two of the foreign Saturnidae require their food to be sprinkled with water, and sometimes even with the addition of salt, to make them thrive. Moths on emergence should not be killed at once, as they are then too flaccid, and have not sufficiently purged themselves. Yet they should not be left too long or over night, as they often fly at that time, and knock themselves about in the cage, to the detriment of their beauty; destroying, in fact, the whole aim and end of breeding, which is of course, inst.i.tuted to procure specimens for the cabinet as fine as it is possible to get them.

In collecting insects it is always as well to bear in mind that a "worn" female, though not of the slightest use to the entomologist, unless she can be induced to lay in confinement, may become the progenitor of many, and may thus afford you during the next season great pleasure in collecting. This being so, I should like to impress upon my readers (the young especially) the propriety of giving all insects, not actually noxious, heir liberty, if on examination they prove to be useless as specimens. These remarks apply also to the case of hybernated females. Many female insects, though unwilling to lay in confinement, may be watched at large, and the flowers and plants on which they have from time to time rested, searched for their eggs.

In concluding this chapter, I feel that I might have said much more upon nearly every section--have explained many new "dodges," and so forth, were it not that the limit of s.p.a.ce has been reached. One thing, however, may be noted as an omission, and that is the recommendation as to what books should be procured by the young entomologist. This is so difficult a matter--depending entirely upon the aim of the individual--that I prefer to leave it an open question, merely making the general statement that nearly all our advanced systems are founded upon the labours of German and French entomologists. [Footnote: Mr. Wm. Wesley. Ess.e.x Street Strand, London, publishes monthly a "Natural History Book Circular," which he will send to naturalists if asked.]

CHAPTER XVI.

ON NATURAL HISTORY MUSEUMS, WITH SPECIAL REFERENCE TO A NEW SYSTEM OF PICTORIAL ARRANGEMENT OF VERTEBRATES.

I MUST confess that, at one time, the consideration of the best method of dealing to advantage with the limited s.p.a.ce usually existing in the older provincial museums would have dismayed me. Even at that time, however, I had glimmerings of the brighter light which has since illumined the way, and I was, perhaps, aided by the persistent manner in which I haunted museums both abroad and at home, until at last I never went on a journey without managing to break it, or to make it end at the then summum bonum of my happiness--a museum. Like Diogenes, I went about with my lamp to find, not an honest man, but an honest museum--a museum with some originality, and with some definite idea as to its sphere of work. Leaving out, of course, such complete and technical inst.i.tutions as the Museum of Geology, the Museum of the College of Surgeons, and such inst.i.tutions which really have a motive in view--steadfastly adhered to--I saw, then as now, that every provincial museum was nothing if left to its own devices, and, if "inspired," was, at the best, but a sorry and servile imitator of the worst points of our national museum.

Everyone must have observed, no doubt, in any provincial museum which dates back thirty or forty years, that the great curse of the collection, so to speak, is sketchy versatility. In walking through the usually "dry-as-dust" collections you find numbers of very atrociously-rendered mammals, a greater sprinkling of funereal and highly-disreputable birds, some extremely-protracted fishes, some chipped insects, and a lot of sh.e.l.ls, chiefly marine, which suggest a.s.sociation with the word "stores." I allude to those odds and ends which people do not want themselves, and which are, therefore, so kindly brought as an offering--would I might say a "burnt" one--to any inst.i.tution so reckless of consequences as to admit them.

Nearly all museums of early days were imitators of the British Museum, whilst those of later days affect the newer treatment of South Kensington. Hence, in walking through any museum, a technical observer can easily detect the sources of inspiration and the lines of demarcation between the old and the new. Really it amounts to this, that hardly any inst.i.tution in England thinks for itself. Museum authorities, like sheep, follow the lead of the most ancient bell-wether; and the reason of this is not far to seek. Curators, as a rule, are men with one hobby--"one-horse" men, as the Americans so aptly put it--"sometimes wise, sometimes otherwise," but in many cases totally devoid of that technical education so much needed in reconciling the divergent atoms of the inst.i.tutions they represent; in fact, head and hand seldom work together.

Often, owing to the want of technical advice, money is wasted in more than one department, cases are too highly paid for, and have not been thought out sufficiently as to their fitness for their future contents, or the position in which they are to be placed, or the more fatal error has been perpetrated of considering them as merely units of a certain department instead of parts of a whole. I contend that if it be necessary for a civil engineer or other professional man to have mastered the various technicalities of his profession, it is also inc.u.mbent on curators to have done or to do likewise, in order that they may grasp the treatment of their museum as a whole, and not fall into the grave fault of working up one department whilst ignoring the others.

Nothing is more distasteful to my mind than that a man in the position of a curator should impertinently ride one single hobby to death, to the utter exclusion and detriment of all other branches of knowledge entrusted to his care. What is the sum total of this? In looking around any museum of old standing we see twenty different styles and colours of cases, which may be briefly summarized as representing the eocene, miocene, and pliocene formation of cases; s.p.a.ce has been wasted, or not utilized as it might be, and the result is a confused jumble of odds and ends, consequent on some persons considering that the end and aim of a museum should be the preservation of "bullets"

collected by "Handy-Andy" from the field of "Arrah-na-Pogue," "My Grandfather's Clock," and so on.

This is certainly not the mission of any museum, nor should it lay itself out with avidity to collect disjointed sc.r.a.ps of savage life, such as portraits of the "ladies" who ate cold savage and who--horresco referens!--"drank his blood." [Footnote: A fact!]

Such a museum object as this, awfully, yet ludicrously, reminds me of that showman who enticed his audience in with--"Here you'll see the Duke of Vellington at the battle of Vauterloo, with the blood all a-runnen down his fut,"' or of poor little "Totty" (in "Helen's Babies"), who loved to hear about "B'liaff" and his headlessness, and the sword that was all "bluggy." This is, I think, one of the mistakes which most museums fall into. They collect a vast quant.i.ty of rubbish utterly useless to anyone but a schoolboy or a showman, and in consequence they find valuable s.p.a.ce wasted to make way for tops of teapots, bits of leather, Kaffirs' or Zulus' knives made in Sheffield, native ornaments, in beads and bra.s.s, made in Birmingham, and such-like members of the great family of "curios." All such as these should be firmly and respectfully declined without thanks. [Footnote: When I first came to the Leicester Museum I was requested to present to the Museum and enclose in a suitable receptacle--No. 1, a piece of thick leather, which the donor thought "just the right thickness for the heel of a boot;" and No. 2 a teapot lid with no particular history, only that--as the dame who brought it phrased it--"maybe it's summat old."]

I have spoken, in somewhat sacrilegious terms, of imitation of the worst points of the old British Museum and of South Kensington (I don't mean the new Natural History Galleries, but artistic South Kensington); but perhaps I may be forgiven when I state that I consider, and always considered, the weakest part of our old natural history galleries at Bloomsbury was the arrangement of all the mammals, birds, etc, in that provokingly "fore-and-aft" manner (spoken of before), on uninteresting stands or perches (hat-pegs) such as the skeletons in Plates II. and III. are represented on.

This, which was, perhaps, inevitable in a national collection professedly showing to the public every species of bird and mammal in the least possible s.p.a.ce, is unpardonable in a provincial museum, which has not the task imposed upon it of attempting to vie with the national collection in point of numbers. Provincial museums, then, if electing to show only animals collected in their immediate vicinity or county (which some authorities--of whom anon--say is the only raison d'etre of a provincial museum), or, if electing to supplement these by showing a few foreign forms of striking appearance, fall into grievous error by mounting the necessarily few specimens they can get together on "hat-pegs," simply because the national collection, with which they are not on "all fours," sets them the bad example in this.