Prodromo di un opera da imprimersi sopra le riproduzione animali.

In this preliminary to a larger work on regeneration which was never published, Spallanzani described regenerative capacities of remarkable complexity and repetitiveness in the land snail, salamander and toad and frog, establishing the general law that an inverse ratio obtains between the regenerative capacity and age of the individual. Digital facsimile from Google Books at this link. English translation as An essay on animal reproductions (London, 1769). Digital facsimile of the English translation from Google Books at this link.