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 butterflies, 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 passes 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 japanned 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 space 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 compass of an ordinary cigar box.
"Drying houses" are sold by most of the dealers, but are expensive and cumbersome, 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.