IV. DE COELO: Book I. 630 Book II. 639 V. EPIKURUS 654 VI. THE STOICS.--A FRAGMENT 660 ARISTOTLE. CHAPTER I. LIFE OF ARISTOTLE. In my preceding work, 'Plato and the Other Companions of Sokrates,' I described a band of philosophers differing much from each other, but all emanating from Sokrates as common intellectual progenitor; all manifesting themselves wholly or principally in the composition of dialogues; and all living in an atmosphere of Hellenic freedom, as yet untroubled by any over-ruling imperial ascendancy from without. From that band, among whom Plato is _facilè princeps_, I now proceed to another, among whom the like pre-eminence belongs to Aristotle. This second band knew the Sokratic stimulus only as an historical tradition; they gradually passed, first from the Sokratic or Platonic dialogue--dramatic, colloquial, cross-examining--to the Aristotelian dialogue, semi-dramatic, rhetorical, counter-expository; and next to formal theorizing, ingenious solution and divination of special problems, historical criticism and abundant collections of detailed facts: moreover, they were witnesses of the extinction of freedom in Hellas, and of the rise of the Macedonian kingdom out of comparative nullity to the highest pinnacle of supremacy and mastership. Under the successors of Alexander, this extraneous supremacy, intermeddling and dictatorial, not only overruled the political movements of the Greeks, but also influenced powerfully the position and working of their philosophers; and would have become at once equally intermeddling even earlier, under Alexander himself, had not his whole time and personal energy been absorbed by insatiable thirst for eastern conquest, ending with an untimely death.