METAMORPHOSIS OF AMPHIBIAN ORGANS 



257 



their hosts but by the animal A to which they both originally 

 belong. 



In both grafts the spots from the very beginning of their 

 appearance were much brighter than the spots of the host; this 

 however, is in no way due to a difference between the rate of 



development of host and graft but must be explained on the 

 ground of a specific difference existing between the spots of 

 animal A from which both grafts were taken and the spots of the 

 animals X and Y; only this assumption can explain the fact, that 

 the same characteristics appeared in both grafts alike and were 

 retained permanently, since the spots were even more unlike 



