28 NATURALISTS' ASSISTANT. 



tin oven, a spirit lamp, a pair of finely pointed scissors, a little 

 fine wire and a straw. 



The oven is a tin box two and one-half inches high, two and 

 one-half wide and five long, the cover is of glass and one end 

 is perforated with a hole one and one-half inches in diameter. 

 See fig. 9. No solder should be used in its construction. 



FIG. 9. 



The wire should be very fine and annealed. It should not be 

 over one-half a millimetre (one-fiftieth of an inch) in diameter. 

 Kill the subject by a drop of ether or by immersion in 

 alcohol. If it be a hairy caterpillar it should remain at least 

 half an hour in alcohol and then rest two hours on blotting 



