1. GENERAL VIEW.—Empedocles was born at Agrigentum, and is extolled by the ancients as a natural philosopher, physician and poet, and also as a seer and worker of miracles. He flourished about 440 B. C., and was consequently younger than Parmenides and Heraclitus. He wrote a doctrinal poem concerning nature, which has been preserved to us in tolerably complete fragments. His philosophical system may be characterized in brief, as an attempt to combine the Eleatic being and the Heraclitic becoming. Starting with the Eleatic thought, that neither any thing which had previously been could become, nor any thing which now is could depart, he sets up as unchangeable being, four eternal original materials, which, though divisible, were independent, and underived from each other. In this we have what in our day are called the four elements. With this Eleatic thought he united also the Heraclitic view of nature, and suffered his four elements to become mingled together, and to receive a form by the working of two moving powers, which he names unifying friendship and dividing strife. Originally, these four elements were absolutely alike and unmovable, dwelling together in a divine sphere where friendship united them, until gradually strife pressing from the circumference to the centre of the sphere (_i. e._ attaining a separating activity), broke this union, and the formation of the world immediately began as the result. 2. THE FOUR ELEMENTS.—With his doctrine of the four elements, Empedocles, on the one side, may be joined to the series of the Ionic philosophers, but, on the other, he is excluded from this by his assuming the original elements to be four. He is distinctly said by the ancients to have originated the theory of the four elements. He is more definitely distinguished from the old Ionics, from the fact that he ascribed to his four “root-elements” a changeless being, by virtue of which they neither arose from each other nor departed into each other, and were capable of no change of essence but only of a change of state. Every thing which is called arising and departing, every change rests therefore only upon the mingling and withdrawing of these eternal and fundamental materials; the inexhaustible manifoldness of being rests upon the different proportions in which these elements are mingled. Every becoming is conceived as such only as a change of place. In this we have a mechanical in opposition to a dynamic explanation of nature.