The comments of a number of mechanistic biologists on vitalism furnish the point of departure for Dewey's discussion.
"John Dewey's logical theory"
Delton Thomas Howard
Energetics, it is true, may obtain a definite meaning for its central conception from the measurable behavior of external bodies, and a meaning that may be quite free from vitalism or teleology.
"The Approach to Philosophy"
Ralph Barton Perry
Cesena 2 June, 1787. In 1813 he published an essay on the Doctrine of Life in opposition to vitalism, and henceforward his life was a conflict with the upholders of that doctrine.
"A Biographical Dictionary of Freethinkers of All Ages and Nations"
Joseph Mazzini Wheeler