Abstract
Dean for few years, he mainly focused his research on a precise criticism of transformism, which began to represent the common explanation of the emergence of life and species. For him, no classical argument in favour of this theory could be retained when considering Morphology as a complete association of structure and function in the whole animal. Beyond some aspects of this criticism related to his time, Vialleton transcends them by his conception of Morphology as an incarnated "platonician idea", that inserts him in the fliation of Montpellier vitalism.