. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. The Capture, Preparation, and Preservation of Specimens Fig. 62.—Tip of inflating-tube, with armature for holding larval skin. for lessening the labor involved have been devised, some of which are to be highly commended. " A comparatively inexpensive arrangement for inflating larvae is a modification of that described in the ' Entomologische Nach- richten' (1879, vol. v, p. 7), devised by Mr. Fritz A. Wachtel (Fig. 61). It consists of a foot-bellows such as is used by ch
. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. The Capture, Preparation, and Preservation of Specimens Fig. 62.—Tip of inflating-tube, with armature for holding larval skin. for lessening the labor involved have been devised, some of which are to be highly commended. " A comparatively inexpensive arrangement for inflating larvae is a modification of that described in the ' Entomologische Nach- richten' (1879, vol. v, p. 7), devised by Mr. Fritz A. Wachtel (Fig. 61). It consists of a foot-bellows such as is used by chemists in the laboratory, or, better still, of a small cylinder such as is used for holding gas in operating the oxyhydrogen lamp of a sciopticon. In the latter case the com- pressed air should not have a pressure exceed- ing twenty pounds to the square inch, and the cock regulating the flow from the cylinder should be capable of very fine adjustment. By means of a rubber tube the air is conveyed from the cylinder to a couple of flasks, one of which contains concentrated sulphuric acid, and the other is in- tended for the reception of any overflow of the hydrated sulphuric acid which may occur. The object of passing the air through sulphuric acid is to rob it, so far as possible, of its moisture. It is then conveyed into a flask, which is heated upon a sand-bath, and thence by a piece of flexible tubing to a tip mounted on a joint allowing vertical and horizontal motion and secured by a standard to the working-table. The flow of air through the tip is regulated by a cock. Upon the tip is fjtstened a small rubber tube, into the free extremity of which is inserted a fine- pointed glass tube. This is provided T*^"' ^ ^ '^ glass with an armature consisting of two steel springs fastened upon opposite sides, and their ends bent at right angles in such a way as to hold the larval skin firmly to the extremity of the tube. The skin having been adjusted upon the fine point of the
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishergardencitynydouble
