itself against universality; and the rest of the Idea necessarily passed into the movement of thought. This movement now, however, in the New Academy turned dialectically against the determination of the Stoics and Epicureans, which rested on the fact that the criterion of the truth ought to be a concrete. For example, in the conception as comprehended by the Stoics, there is a thought which likewise has a content, although, again, this union still remains very formal. But the two forms in which the dialectic of the New Academy turns against this concrete, are represented by Arcesilaus and Carneades. 1. ARCESILAUS. Arcesilaus kept to the abstraction of the Idea as against the criterion; for though in the Idea of Plato, _i.e._ in the Timæus and in his dialectic, the concrete was derived from quite another source, this was only admitted for the first time later on by the Neo-platonists, who really recognized the unity of the Platonic and the Aristotelian principles. The opposition to the Dogmatists thus does not in the case of Arcesilaus proceed from the dialectic of the Sceptics, but from keeping to abstraction; and here we perceive the gulf marking out this epoch from any other. Arcesilaus was born at Pitane in Æolia in the 116th Olympiad (318 B.C.), and was a contemporary of Epicurus and Zeno. Though he originally belonged to the Old Academy, yet the spirit of the time and the progressive development of Philosophy did not now admit of the simplicity of the Platonic manner. He possessed considerable means, and devoted himself entirely to the studies requisite for the education of a noble Greek, viz. to rhetoric, poetry, music, mathematics, &c. Mainly for the purpose of exercising himself in rhetoric, he came to Athens, here was introduced to Philosophy, and lived henceforth for its sake alone; he held intercourse with Theophrastus, Zeno, &c., and it is a subject of dispute whether he did not hear Pyrrho also. Arcesilaus, familiar with all the Philosophy of those days, was by his contemporaries held to be as noble a man as he was a subtle and acute philosopher; being without pride in himself, he recognized the merits of others. He lived in Athens, occupied the post of scholarch in the Academy, and was thus a successor of Plato. After the death of Crates, the successor of Speusippus, the place of honour in the Academy devolved on Sosicrates, but he willingly gave it up in favour of Arcesilaus on account of the superiority of the latter in talent and philosophy. What really happened as regards the transference of the chair to others, is, for the rest, unknown to us. He filled this office, in which he made use of the method of disputation, with approbation and applause, until his death, which took place in Olympiad 134, 4 (244 B.C.), in the seventy-fourth year of his age.[169]