HOW TO KNOW THE BUTTERFLIES 



strength. With proper care a bottle will retain 

 its strength for several months. 



Specimens placed in the bottle to be killed 

 should be left there for at least a half hour. They 

 may be left in the bottle several hours, even over- 

 night, without injury. 



Collectors of butterflies usually have a shal- 

 low tin box, lined with pith or cork, into which 

 specimens can be pinned, and fitted with a strap by 

 means of which it can be slung over the shoulder 



(Fig. 1 6). A 

 cheap substitute 

 for such a box 

 can be made by 

 using a shallow 

 and fitted with a 



Fig. i 6. — A collecting-box. 



cigar-box, lined with cork 

 strong cord. 



There is another method of caring temporarily 

 for specimens of butterflies, which is used when 

 it is not convenient to pin them. The specimen 

 is killed while it is yet in the net with chloroform 

 or by pinching the thorax, care being taken that 

 the wings are folded together above the back, so 

 that they shall not be rubbed. Then the speci- 

 men is dropped into a triangular envelope made 

 by folding a piece of paper, as shown in Figure 

 i 7, and a memorandum of the locality and date 



3° 



