NOISE MADE IN FEEDING. 



39 



It again feeds during five days, after which it casts 

 its skin for the fourth and last time in the cater- 

 pillar state. 



PROGRESSIVE GROWTH OF THE SILKWORM. 



It is now about one and a half or two inches 

 in length, and devours its food most voraciously, 

 increasing rapidly in size during ten days. When 

 the worms are fed a slight hissing noise is heard 

 similar to that of green wood burning. According 

 to some writers this noise proceeds from the 

 action of the jaws, but others attribute it solely 

 to the action of the feet, which are continually 

 moving until the worms have fastened to their 

 food, when the noise ceases. In a large nursery 



