GENERAL ACCOUNT OF BUTTERFLIES 



ing outfit, consisting of a net, a killing-bottle, a 

 few vials or pill-boxes for bringing home living 

 larvae, a cork-lined collecting box, and a vial of 

 chloroform with a small brush fitted in 

 the cork. 



The usual form of an insect-net is 

 shown in Figure 14, and the killing- 

 bottle in Figure 15. The bottle is pre- 

 pared in the following manner : 



Take a wide-mouth bottle holding 

 four or six ounces. Put in this a piece 

 of cyanide of potassium, about three- FlG - 14 - — An 



J insect-net. 



fourths of an inch square, and water 

 enough to cover the cyanide ; and then immedi- 

 ately, before there is time for the 

 cyanide to dissolve, put enough plas- 

 ter of Paris in the bottle to entirely 

 soak up the water. In this way the 

 cyanide will be firmly cemented in 

 place in the bottom of the bottle. 

 The bottle should then be left open 

 in a shady place for an hour to dry, 

 and then securely corked with a long 

 Fig. 15.— A kill- cor ^ anc j labeled Poison, after which 



ing-bottle. 



it is ready for use. 

 In using a cyanide bottle care should be taken 

 not to leave it open unnecessarily, lest it lose its 



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