He was one of the first, if not quite the first, to propound the conception of periodicity among the chemical elements.
It is, however, only noticed here on account of the numerous references made to it by succeeding writers, for neither in this nor in the author's second volume (not published until 1814) did he propound any systematic arrangement of the Class.
Aristotle did not definitely and in tabular form propound a classification of animals, but from a study of his treatises Historia animalium, De generatione animalium, and De partibus animalium the following classification can be arrived at: - A.
But it was not until 1860 that he definitely began to propound a new social scheme, denouncing the dogmas of political economy.
Philolaus was the first to propound the doctrine of the motion of the earth; some attribute this doctrine to Pythagoras, but there is no evidence in support of their view.