Practical Taxidermy Part 30

Fig. 46--"Sugaring" net.

The insect being captured, you twist your net rapidly over to get it as near to the bottom as possible--a very necessary precaution in the case of a swift-flying or excitable insect. Holding the net now in the left hand, take the bottle, previously uncorked, in your right hand and slip it into the net and over the insect. In case of refractory insects, blowing from the outside will sometimes make them go to the bottom of the bottle. When this happens, you can slip your hand from the outside over the mouth of the bottle, and hold it there until the insect is corked up. In less than a minute it is stupefied and motionless. If taken out, however, it will revive; it must be left in, therefore, from ten to fifteen minutes. In the case of female insects which have not yet deposited their eggs, and are consequently exceedingly tenacious of life, a longer time will be found necessary.

Bruised laurel leaves, chloroform, benzol, etc, are recommended by some authors. The first is, I think, uncertain in its effects, and has, perhaps, a tendency to make the insects go ultimately mouldy. The second stiffens the wing rays of some insects to such an extent as to render them difficult to set. It has been recommended in the case of large insects, such as the hawk moths, to pierce them underneath the thorax at the insertion of the first and second pairs of wings with a steel pen dipped in a saturated solution of oxalic acid. I have frequently done this myself with good results in the days when cyanide bottles were unknown, but for the largest hawk moths--"Death's heads"

even--I find nothing to beat a large bottle (a gla.s.s jar, such as the French bottle plums in, does admirably), in which is placed about 0.25 lb. of cyanide. With a killing jar of this kind, which I call the "home" bottle, I have frequently instantaneously killed mice and even rats. In fact, the volume of poisonous vapour evolved from one of these bottles is such, that I advise my readers not to take "sniffs"

therefrom, lest severe headaches, or worse results, should follow.

As it is nearly all but impossible to pin an insect so correctly as you would wish during the hurry and excitement of b.u.t.terfly hunting, I recommend that all insects captured when the collector is from home be laid on their sides, and the pin pa.s.sed through the body whilst in that position. This saves the unnecessary marking of the thorax by more than one pin hole, as the pin can be removed without detriment to the formation of the body, and the insect pinned in its proper position when the collector reaches home.

SETTING.--Having brought the entomologist to this point, I may discuss what to do to preserve the trophies of the day's chase. First, then, the insects must be "set." To do this properly is the vexata quaestio of the day. As a nation we anciently practised the "setting" of lepidoptera with four or eight braces, two or one underneath and two or one on top of the wings. The wings were then not so fully extended as now, but the body was pressed as close to the setting board as it was possible to get it. The next step was the cork setting board, cut to show in section nearly a half oval, the bodies were a little raised from the set, and the rounded points of the fore and hind wings invariably touched the paper of the cabinet when placed therein, curling up wherever they touched.

Fig. 47--Section of "Setting Board"

Fig. 47 shows a section of a "setting board" designed to remedy this evil. The block A is formed of a piece of 0.75 in. deal, 12 in. to 14 in. long, and of varying widths according to the insects required to be set. Exactly in the centre a groove is "ploughed" to the depth of 0.5 in.; from the outer edges of this groove B the board should be "pitched" or "bevelled" 0.125 in. on each side to its outer edge. On top of each half, a piece of 0.125 in. cabinet cork C C is glued, and also in the groove B, where shown at C.

Presuming that you have a "Red Admiral" to set with 1.125 in. or a No.

13 pin, you will find, if allowing 0.125 in. for the body, that after setting an insect in a board of this kind the matter will be pretty evenly adjusted--that is to say, about 0.5 in. of pin above and below the b.u.t.terfly. This allows the insect when placed in the cabinet to be well clear of the paper, and is the mode now generally adopted by those entomologists who effect a compromise between the ridiculous English low setting and the Continental "high-set." What the real objections are to this latter setting it has always puzzled me to discover, unless it is the true British objection to anything foreign or "French."

In a foreign Camberwell Beauty (Vanessa Antiopa) which I have just measured, the relative proportions are as follow: The whole length of the pin is 1.5 in, it comes through the body on the underside 0.875 in, whilst above the body it shows but a little more than 0.25 in. Its advantages are manifest. First, it brings the insects much nearer the eye when placed in the cabinet. Secondly, by its position the body is prevented from greasing the paper of the cabinet (a not unimportant item when the reader is told that the white velvet of a newly-lined cabinet drawer has been utterly ruined by the grease from the bodies of low-set insects). Thirdly, the almost total immunity from "mites"

which high-set insects enjoy.

This last consideration ought to induce our entomologists to adopt the Continental set nem. con. For what entomologist dare tell me that he has no mites in his cabinet? Is it the user of camphor, of creosote, of phenic acid, or of corrosive sublimate? Why, then, this foolish prejudice against the high-set? I have tried both plans, low setting for fifteen, and high setting for ten years. I have, as an experiment, mixed high-set insects in with low-set "exchanges." The brown dust underneath the latter tells their tale too well. In a box of foreign high-set insects which I have had by themselves for four or five years little or no trace of the destroyer is to be seen.

Reform your "setting boards," then, say I; plough your grooves deeper, and if you object to the flat appearance of the foreign set insects, there is no earthly reason why you should not "pitch" your boards to the angle I show in Fig. 47, or to any other angle you desire. The objection to this "high-set" lies in a nutsh.e.l.l: it looks "odd" to one accustomed to the English method, and that is really all to be advanced against its general use.

Let me, therefore, ask my brother entomologists to give the "high-set"

a fair trial, and not to be deterred by the sneers of any novice. It may strengthen my pleading and terminate the hesitation of the young entomologist if I mention here that the officer in charge of the collection of lepidoptera in the British Museum--the well-known authority, A. G. Butler, F.L.S, etc.--is not only setting all newly-received b.u.t.terflies and moths in precisely the fashion advocated above, but is actually re-setting all the old "low-set"

insects in the same manner!

Whilst on the subject of foreign insects I should like to impress upon the young beginner not too greedily to rush after "real British"

specimens of rarities, or he may find that he has purchased, at the expense of some pounds, perhaps, a reset continental type worth as many pence. I fancy I see our would-be entomologist shaking his head and very sagely saying, "Oh no! I intend to collect all my insects myself." My young friend, let me tell you that you will have to collect far beyond the prescribed threescore years and ten if you would yourself collect all the British lepidoptera. Work, therefore, in collecting as hard as you can, and when you want a rarity to fill up a void in your cabinet, go at once to some respectable dealer and ask for a continental type of the insect you want, place it in your cabinet, label it "Foreign," and when you can replace it with an undoubted "Britisher" think yourself lucky.

Fig. 48--b.u.t.terfly "braced" on board.

To make my meaning plain, we will take the Bath White b.u.t.terfly (Pieris Daplidice) as an example. An undoubted British specimen of this, caught, say, at Dover, is certainly worth a sovereign--the price of a continental one precisely similar, but captured on the other side of the "silver streak," 5d. Difference in cost for a mere fancy, 19s. 7d.!

Again, what would be the price of an English captured Oleander Hawk (Ch.o.e.rocampa Nerii)--shall we say from 12 to 20 pounds, according to the conscience of the vendor and the pocket of the purchaser? A fine foreign specimen, beautifully set and precisely similar, can be bought for about 5s.

To set your b.u.t.terflies, see Fig. 48, which shows a common white b.u.t.terfly braced on the setting board. To do this your insect must be truly pinned as before directed, and placed in the centre of the groove A B (which is also shown in section at B, Fig. 47); four pieces of thin cardboard, each about 1 in. long, are cut to the shape shown at C C C C. An ordinary pin is pushed a little way through them at their bases.

With a fine needle now lift up from underneath the left hand upper wing of the insect to about the angle shown in Fig. 48; picking up a brace with the left hand, push the pin in the cork in such a manner that the brace lightly holds down the wing. Do the same with the underwing. Repeat with the other side. [Footnote: The braces shown in Fig. 48 should be a little nearer the tips of the fore wings, or supplemented by stiff papa pinned across, otherwise the tips are likely to curl up when drying.]

I have been a.s.suming that the wings of the insect previously lay flat.

If they are folded up above the back they had better be pushed down with the braces instead of with the needle, and pinned to any position they will readily fall to, and from that gradually worked up by means of another brace to the angle required. The fore pair of legs should be braced to the front, and hind pair of legs, especially of moths, are to be braced out to fall neatly between the body and the wings.

Sometimes very fine cambric needles are thrust through, just underneath one of the wing rays, to lift up and keep it in position, -until the braces can be brought to bear. This ought not to be resorted to except in extreme cases, or for other than cabinet specimens.

A correspondent (Mr. G. H. Bryan) writing in Science Gossip for December, 1883, says:--"The grooved cork, instead of being glued to one wooden board, is fastened on to the two boards, the groove between them corresponding exactly with the groove in the cork. These in turn are held together by three slips of wood, to which they are firmly nailed. In setting insects, the pin should not be run into the groove just above the slips. If run into the cork anywhere else, the pin can be pushed through to any depth required, and, as a rule, the slips are so high that, when the board is laid down on a table, none of the pins touch the table."

I some time ago saw, at the house of a well-known naturalist and traveller, residing near Cirencester, an ingenious arrangement applied to setting-boards, by which the groove of each board could be altered so as to take in the body of the smallest or the largest b.u.t.terfly or moth at will. It was managed by one half of the board being movable from its fellow, and capable of being adjusted to any size, by simply turning a screw working in a slot in a bra.s.s plate at top and bottom.

Another method of setting insects is by means of "blocks," sections of varying widths cut from the uncorked setting-board, the grooves only being corked. The insect being pinned in the groove is extended with the setting needle, and the wings lightly wrapped, when in position, with silk coming over and over, from side to side. To do this nicely requires practice, to avoid marking the wings with the silk.

The "block" system of setting is more used by collectors in the Midlands and the North than about London or in the South. Insects should be left on the setting-boards or blocks from two or three days to a week, or even more, according to their size; and during this time should be kept out of the dust, but allowed air to dry them thoroughly.

The German system of setting by means of pieces of gla.s.s dropped over the wings when in position is a clean neat method of "flat" setting, allowing the insect to be clearly seen if it be truly "set" or not.

When insects are from any cause too stiff to set without first relaxing them--placing them in the cyanide bottle for a day or night will often do this effectually, or placing them in a wet corked zinc box, or in a box with damp sand, or in a small "plaster box" will do equally as well. This is made by lining the whole of the inside of a wooden box with plaster of Paris mixed with water, and laid on from one to two inches thick. The plaster is, of course, thoroughly damped, and the insects enclosed in the box. The same pins with which they are pinned whilst relaxing should not be permanently left in, if it be possible to remove them without injuring the aspect of the thorax.

Pins so left in, being more corroded than usual, frequently break after being in use a short time.

Old insects, which it may be dangerous to relax, or large foreign unset lepidoptera, may sometimes be set by a skilful hand by having their wings carefully pinched off by forceps, and replaced in the required position by using a strong paste or cement (see Formula No.

33): Repairs may be "executed with promptness and despatch" by cementing on parts of other wings to replace torn or missing pieces, or tissue paper may be used, providing the repairer is a skilful artist. I once saw a very poor specimen of Urania rhipheus--a splendid moth from Madagascar--so cleverly pieced by tissue paper and coloured, that it would deceive any but an expert.

Beetles (in science--Coleoptera) may be sought for everywhere--in woods, fields, ponds, rivers, underneath stones and exuviae of cattle; in decaying leaves, trees, and fungi; in and underneath dead animals; in cellars, outhouses, and even in what would be supposed the most unlikely place to find them--ant hills, bees' and wasps' nests--and in the rubbish collected at the sides of streams, especially if after a flood. They may be taken by sweeping, beating, sugaring, or by carefully prospecting tufts of gra.s.s, moss, leaves, and flowers. Bags of moss or ant-hills may be brought home and looked over at leisure for minute beetles--throwing rubbish into water, or sifting it over white paper, being the handiest way to reveal them.

For those which inhabit water, a net made of any strong material, which allows water, but nothing else, to run through quickly (a net fashioned as in Fig. 41 or 46 will do for this), should be used as well as for collecting other water insects. Beetles may be brought home in small test tubes, corked at the open end, or in quills stopped at one end with sealing wax, and at the other with wadding, or a quill may be inserted in the cork of a larger bottle, into and through which they may be dropped, or they may be killed at once in the cyanide bottle, or otherwise thrown into a bottle containing alcohol, in which corrosive sublimate (in the proportion of 6 gr. to the ounce of spirit) has been previously placed, which effectually kills and ultimately tends to preserve them.

On reaching home, the contents of this bottle may be turned out into any shallow dish kept specially for that purpose (a photographer's "print" pan) and fished for with small pieces of paper or cardboard, and the spirit afterwards returned to the bottle. The larger beetles are to be pinned through the right wing case, and never in the centre, their legs being nicely arranged in the proper positions, and in some cases the wings may be displayed. The more minute beetles may be gummed on a small slip of card through which the pin pa.s.ses, their legs arranged by the aid of fine patience, a crooked pin, a camel-hair pencil, and a pair of small forceps, the latter being also very handy for picking up any other small objects.

In setting the larger beetles, as well as the various thick-bodied insects, belonging to the orders Orthoptera, Neuroptera, Diptera, and Hymenoptera, double braces instead of "setting"-boards may be used in the following manner: The insect being pinned high on a board or piece of cork, with legs extended, two large pieces of card, one for each side, are brought up underneath the wings and close to the body by pins stuck through the corners. This forms a rest for the wings when extended, which are then braced on top of the cards by smaller braces in the usual manner, the pins, however, of the braces falling outside the supporting cards and fixing in the wood or flat cork underneath.

Many exotic insects--b.u.t.terflies and moths--are set in this manner, which is really "flat setting." If the braces are at any time too limp and do not seem to clip the wings properly, a little piece of cork just sufficient for the pin to slip through may be added on top of the brace.

The larger beetles and other insects, such as the dragon-flies, cicadas, gra.s.shoppers, and "walking leaf" insects, should always have the contents of the abdomen removed either by pressure, or by being cut underneath, and, when empty, injected with a little of the corrosive sublimate preparation, and afterwards filled out with wool or blown out with a small blowpipe until the abdomen is again distended and dry. Some insects which are narrow at the "waist" may be advantageously snipped through at that part to remove the contents therefrom, the body being afterwards fixed with gum or cement to its normal position.

In the setting of beetles--as in other things--the ubiquitous Germans and the Frenchmen beat us. Compare the beautifully foreign set coleoptera, with our wretchedly lame and uneven-sided attempts. It is impossible to mistake the ordinary English for foreign setting, and of this I was curiously convinced on my arrival at Leicester, in the Museum of which town I found some exquisitely-set specimens of coleoptera. I said at once, "These are German-set." "No, indeed," I was told, "they are set by a local man." I could not believe it; and after great difficulty, the man himself even persisting in this a.s.sertion, I discovered that they were all procured from Germany or were set by a German friend.

This gentleman having subsequently shown me his method, I now give it for the benefit of coleopterists: The beetles, after being killed, are plunged into benzoline (benzol) for two or three days, to cleanse them from grease and impurities. Indeed, it considerably simplifies matters to carry a bottle of benzol, as I do when collecting beetles, to plunge them into when first taken. It instantly kills, and the cleansing operation goes on at once. On reaching home the beetles are, after a day or two, pinned, or gummed unset on to any pieces of card in any manner most suitable at the time to economise s.p.a.ce; the cards can then be pinned into a store-box.

During the winter months, or at any time when required, the beetles may be set, thus: first, plunge them into water for a day or so until quite limp, then take them out and place them one by one on separate pieces of card, well gummed in the centre to retain them firmly by the abdomen whilst being set. A very little time will suffice to do this should the gum be strong.

After twenty or so are fixed, the first one gummed down can be finished off. The card is smeared with gum where the legs, or rather "tarsi," will come into place, and arranged with a setting needle. Now carefully place the limbs into a natural and even position, their feet resting on the gummed surface; adjust the antennae, etc, and leave the insect to dry by pinning the card in any suitable receptacle. When perfectly set and dry, the final operations are once more plunging the beetle into benzoline, then wetting its abdomen and feet to release it from the dirty card, and lastly slightly re-gumming the underneath and tips of the feet with cement (see Formula 33) and finally adjusting it on a clean card, which may be labelled or numbered, and secured by a small pin at each end in the cabinet or store-box.

COLLECTING AND OTHER BOXES.--The collecting box is a small box made to fit the pocket, corked top and bottom, opening in the middle, and made of sufficient depth to allow the heads of the pins on one side to well clear the insects, which may be pinned on the other. Collecting boxes may be made of various woods and of various sizes to suit the pleasure and pocket of the collector. They should be made light but strong, and a little fillet of thin wood should be inserted along one side on the front edge, to ensure the close fitting of the box. Another sort of collecting box is that corked at the bottom, having a flat lid, on which a piece of cork is glued, and cut to fit the box tightly when closed, thus forming the top lid. This style is also used for postal boxes.

In very hot weather, or if the collector roves far afield, he will find that many of his b.u.t.terflies, if placed in the ordinary wooden collecting box, will have become stiff before he can reach home to set them. The remedy for this is a zinc box lined with cork, which latter is soaked in water before commencing the day's collecting. These boxes are made in various shapes and sizes. A handy one for the pocket is a 7 in. by 4 in, 2.5 in. deep, made of an oval shape if desired, corked on top and bottom, the cork held by clips of zinc soldered to top and bottom. For more extended operations a larger box will be required, say, 13 in. by 9 in, 2.5 in. deep, with loops soldered to the back, through which a strap pa.s.ses to suspend it from the shoulders. These boxes are lighter if made in tin, and the water does not corrode them so rapidly if they are j.a.panned inside as well as out.

"Postal boxes," by which entomologists transmit their captures to one another, should be made of strong white pine, the tops and bottoms nailed on, on the cross. They may open in the middle or at top, as before mentioned, and further have a strengthening piece of thick cork glued all over them outside and rasped down to the shape of a rough oval.

Inside, the cork should be glued down on top and bottom; on this a few small strips of the same cork running across with interstices left between them. On top of this another sheet of cork, thus forming three thicknesses, in which the pin is pushed as far as it will go. In the case of large-bodied moths, or any valuable insects, it is as well to support the abdomen with a layer of wool, cross-pinning the body on either side to prevent it jarring or shifting. The box may then, for greater security, be wrapped in a sheet of wool and tied up. The address should not be written on the box, or the stamps affixed thereto, but on a direction label, otherwise some vigorous post-office sorter, or stamper, will convince you to your sorrow that he scorns such paltry protection as is afforded by the triple alliance of wood, cork, and wool.

The Germans cover the bottoms of a great many of their entomological boxes with peat, and this certainly holds the long pins firmly in transit; and it is also much less expensive than cork.

Foreign insects, when s.p.a.ce is limited, may be sent home unpinned and unset, their wings folded over their backs, and each specimen wrapped in silver or tissue paper. It is astonishing what a number of them will pack in this manner in the compa.s.s of an ordinary cigar box.

"Drying houses" are sold by most of the dealers, but are expensive and c.u.mbersome, and are really only of service when travelling, or collecting away from home. For this reason I suggest the following--which is a store box and receptacle for setting boards combined.

Make of 0.5 in. deal a box 20 in. long and 15 in. wide by 0.5 in. deep (all inside measurements), glue up all but the front piece (4 in. wide by 20 in. long), which merely tie in its place whilst glueing up the others. Cut the box when dry through the 4 in. back piece to exactly halve it. Hinge each half with strong hinges. It now resembles an open backgammon board box, without its two fronts.