. The butterfly book [microform] : a popular guide to a knowledge of the butterflies of North America. Butterflies; Papillons. II WIT , Preparation, and PrtMrvation of Spteimtna then applied to these upturned edges; and it is inserted into the Jar and pasted securely over the cyanide by the upturned flaps. A jar thus charged will last for a long time, if kept properly closed when not in use. Cyanide of potash has a tendency to deliquesce, or melt down in the presence of moisture, and In very humid cli- mates or damp places, if the jar is not kept well stoppered, the cyanide will qui
. The butterfly book [microform] : a popular guide to a knowledge of the butterflies of North America. Butterflies; Papillons. II WIT , Preparation, and PrtMrvation of Spteimtna then applied to these upturned edges; and it is inserted into the Jar and pasted securely over the cyanide by the upturned flaps. A jar thus charged will last for a long time, if kept properly closed when not in use. Cyanide of potash has a tendency to deliquesce, or melt down in the presence of moisture, and In very humid cli- mates or damp places, if the jar is not kept well stoppered, the cyanide will quickly become semi-fluid, the paper will become moist, and specimens placed in the jar will be injured or com- pletely ruined. It is well, however, to bear in mind the fact that the fumes of hydrocyanic acid (prussic acid), which are active in producing the death of the insect, will not be given off in suffi- «:ient volume unless there is some small amount of moisture pres-. FiG. 48.—Method of disabling a butterfly by pinch- ing it when in the net. ent in the jar; and in a very dry climate the writer has found it sometimes necessary to add a drop or two of water from time to time to the cyanide. The same method which has been described for charging a jar with cyanide of potash can be employed in ciijrging it with carbonate of ammonia. Field-Boxes.—Ivi collecting butterflies it is often possible to kill, or half kill, the specimens contained in the net by a smart pinch administered to the insect by the thumb and the first finger, the pressure being applied from without the net (Fig. 48). This mode of procedure, however, unless the operator is careful, is "^ to somewhat damage the specimens. The writer to h the insect firmly between the thumb and the first finger, and ap, a drop or two of chloroform from a vial which should be carried in 30. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectbutterflies
