238 



THE INSECT WORLD. 



of a reddish green. One race raised in Tuscany, near Pistoia, 

 has cocoons of a pale rose colour ; and, lastly, mention has been 

 made of cocoons of a purple colour. 



Fig. 216. Larva, pupa, couoon, and moth of Bomlyx mori. 



When the cocoons are completed, the people in charge of the 

 rearing establishments separate them from the heather and sell 

 them to the silk-spinners. But they must manage to get these 

 cocoons into a state in which they will remain entire during 



