2.^,6 



THE INSECT WORLD, 



Fig. 2i6.— Larva, pupa, cocoon, and moth of Bombyx mori. 



development of the Imago is an operation which is called the etouffage, 

 or stifling. 



To effect this stifling, the cocoons are exposed to a high tem- 

 perature. Formerly, in the C^vennes, the cocoons were placed m a 



