596 



Fernon L. Kellogg. 



regeneration at all led me to modify the later experiments as 

 follows: In one lot of worms one prop-leg and one thoracic 

 leg were cut off in the case of each individual halfway between 

 base and tip, or at least always somewhat above the base, while 

 in another lot of larvae taken at the same time, at the same age. 



Fig. 3. 



Fig. 4. 



Fig. 5. 



Fig. 6. 



Fig. 3. Regenerated thoracic leg of full-grown larva from stump of leg cut off just 

 above base after the second moulting. 



Fig. 4. Regenerated thoracic leg of full-grown larva from stump of leg cut off just 

 above base after the second moulting. 



Fig. 5. Regenerated thoracic leg of full-grown larva from stump of leg cut off just 

 above base after the second moulting. 



Fig. 6. Regenerated thoracic leg of full-grown larva from stump of leg cut off 

 just above base after the second moulting. 



the legs were cut off as close to the body as possible. The results 

 indicated that a condition, which I expected would.be revealed, 

 actually does exist. The larv?e with legs cut so as to leave a 

 stump in all cases regenerated the leg more or less nearly com- 

 pletely, although in practically all cases of smaller size than the 

 original; while those larvae whose legs had been cut off as near 

 the body as possible, i.e., wholly removed, in no case regenerated 

 a leg or any part of one. That is, the silkworm's leg can regener- 



