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.
Not twenty years after Luther's defiance of the pope, the startling thesis " that all that Aristotle taught was false " was prosperously maintained by the youthful Ramus before the university of Paris; and almost contemporaneously the group of remarkable thinkers in Italy who heralded the dawn of modern physical science - Cardanus, Telesio, Patrizzi, Campanella, Bruno - began to propound their Aristotelian theories of the constitution of the physical universe.
Historically, his importance lies in the fact that he was the first to propound socialism as a practical policy, and the father of the movements which played so conspicuous a part in the revolutions of 1848 and 1871.
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.