As a further illustration, we may take the results of experiments in which a Urodele organiser (from Triton alpestris) is grafted into an Anuran embryo (Bufo vulgaris).

It is well known that an anuran tadpole or an insect larva will never turn into its adult form if the respective endogenous metamorphic hormones, thyroxine and ecdysone, were withd…

Inactivity may dominate an anuran’s life. Spea hammondii in the deserts of southwestern North America spend >90% of their life inactive; they appear explosively and breed with the…

The fact that the higher Batrachia go on metamorphosing until several of their structures are so perfect as to require but the gentlest modification to make them fit for the Mammal…