ABSTRACT
Supernumerary limbs induced in the flank of larvae of Triturus helveticus by homoplastic grafts of nasal placode are frequently abnormal in structure. Some are highly polydactylous, others hypodactylous, and yet others are mere protuberances whose character as limbs cannot be assumed from their appearance in vivo.
The amputation of such induced formations at a level close to the flank of the larva is usually followed by regeneration. The regenerates so formed are, in most cases, more nearly normal in structure than the original inductions they are replacing. A second amputation and regeneration may completely restore normality.
The possibility of explaining these results in terms of the known peculiarities of supernumerary induced limbs is discussed.
