52 



BUTTERFLIES 



the sawdust, pour liquid plaster of paris carefully so that 

 it will harden into a layer about half an inch thick. 

 Allow the plaster to become thoroughly dry, then insert 

 the stopper into the bottle and it will be ready for use. 

 It is better to use a ground glass stopper so that the bot- 



Butterfly Envelopes. Fold first on line AB; then on AD and CB; then 

 on BF and EA. (From Holland) 



tie will always be air tight. The sawdust is often omitted, 

 the plaster of paris being poured directly over the cyanide. 

 The special advantage of the sawdust is that it tends to 

 absorb the cyanide in case it liquefies, as it often does in 

 damp weather. As this cyanide is a deadly poison, it 



is better to let a druggist 

 prepare the bottle or else 

 to buy it already pre- 

 pared of the dealers in 

 such supplies. 



After the specimens 

 have been killed in the 

 cyanide bottle, some 

 method of keeping them 

 is necessary. The 

 simplest way is to pre- 

 serve them with their wings closed together in pieces 

 of paper folded over into triangles as indicated on the 



Setting Board with Butterfly in place. (From 

 Holland) 



