11' 



ILLUSTRATIONS. 



PLATE L 



Fig. 1. Rack for rearing silkworms, showing on top tray the arrange- 

 ment of bundles of spinning material in the litter. 



PLATE II. 



Fig. 1 . Newly hatched silkworms. 



2. Silkworms before firfet moult. 



3. Silkworms after first moult. 



4. Silkworms before second moult. 



5. Silkworms after second moult. 



PLATE III. 



Fig. 1. Silkworms before third moult. 

 2. Silkworms after third moult, 



PLATE IV. 



Fig. I- Silkworms full grown. 



2. Silkworms ready to spin. 



