lepidopterous larvae and pupae and their surroundings. 147 



3 in. deep by 1 in. wide) with glass fronts, at an angle of 

 about 45°. Both larvae and pupae were kept in a strone 

 north light. & 



The hut in which the experiments were carried out 

 was roofed with iron, and was generally a good deal 

 warmer than the outside air. This probably had the 

 effect of hurrying on the stages, for the larvae never 

 attained a greater length than about H in. 



