28 NATURALISTS’ ASSISTANT. 
tin oven, a spirit lamp, a pair of finely pointed scissors, a little 
fine wire and a straw. 
The oven is atin 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 w:th a hole one and one-half inches in diameter. 
See fig. 9. No solder should be used in its construction. 
oe 
Fic. 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 
