304 



Figs. 38, 39, and 40 suggest how crushing results in such 

 dupHcations. 



One of the most remarkable observations I have made is 

 that in sixty-nine damaged legs of Agroiis prónuba larvae, some- 

 times six in one individual, occurring naturally (?) and accident- 

 ally by the larvœ biting each other, I believe, resulted in not one 

 observable result in the imagines, whose limbs were all perfect 

 and of full size, yet the injuries were identical with those that 

 left very marked deficiencies in the imagines of L. dispar. 



In S. fagi and S. carpini some half-dozen specimens showed 

 similar results to those in L. dispar. 



I have preserved the parts illustrating eleven experiments 

 on the antennse of Ennomos autumnaria and nine of Saturnia 

 carpini. These show various defects in the imagines, but the 

 larval antennae are too small to handle with precision, and the 

 preparations of the larval cast heads are not easy to interpret 

 owing to the crusts formed, so that beyond the few facts that 

 the imaginai antennae may be wanting, variously defective, or 

 all but normal, there is nothing that I have learned from these 

 experiments. 



There are some dozens of specimens, in which, due to various 

 accidents, the records are imperfect, and none of these appear 

 to show any effects that under this condition require comment. 

 The general conclusions I draw from these experiments are 

 that unless a very radical removal of the leg be made, regeneration 

 always takes place, that regeneration of the whole leg takes 

 place when the femur and part of the trochanter and even coxa 

 are removed, if four or five further moults have to take place, 

 but regeneration is less perfect the fewer the following instars, 

 and more perfect the fewer the number of the joints remoxed. 

 The variation of the results in diñerent instances of the same 

 injury at the same stage may be due, to some extent, to difíerent 

 vital stamina in the individuals, but more probably to difíerent 

 tissue accompanying the operation, or to some slight septic 

 action causing a weakening of the tissues involved and conse- 

 quent slowness to undergo development. 



There was always some eñort at regeneration, but if there 

 were too few moults, one only, for instance, after the injury, 

 some defect always resulted. The only exception to this is 



