The manner in which that development took place illustrates the vigour of the Grecian mind. In Egypt a doctrine might exist for thousands of years, protected by its mere antiquity from controversy or even examination, and hence sink with the lapse of time into an ineffectual and lifeless state; but the same doctrine brought into a young community full of activity would quickly be made productive and yield new results. As seeds taken from the coffins of mummies, wherein they have been shut up for thousands of years, when placed under circumstances favourable for development in a rich soil, and supplied with moisture, have forthwith, even in our own times, germinated, borne flowers, and matured new seeds, so the rude philosophy of Thales passed through a like development. Its tendency is shown in the attempt it at once made to describe the universe, even before the parts thereof had been determined. [Sidenote: Anaximenes asserts that air is the first principle.] [Sidenote: It is also the soul.] [Sidenote: The air is God.] But it is not alone the water or ocean that seems to be infinite, and capable of furnishing a supply for the origin of all other things. The air, also, appears to reach as far as the stars. On it, as Anaximenes of Miletus remarks, "the very earth itself floats like a broad leaf." Accordingly, this Ionian, stimulated doubtless by the hope of sharing in or succeeding to the celebrity that Thales had enjoyed for a century, proposed to substitute for water, as the primitive source of things, atmospheric air. And, in truth, there seem to be reasons for bestowing upon it such a pre-eminence. To those who have not looked closely into the matter, it would appear that water itself is generated from it, as when clouds are formed, and from them rain-drops, and springs, and fountains, and rivers, and even the sea. He also attributes infinity to it, a dogma scarcely requiring any exercise of the imagination, but being rather the expression of an ostensible fact; for who, when he looks upward, can discern the boundary of the atmosphere. Anaximenes also held that even the human soul itself is nothing but air, since life consists in inhaling and exhaling it, and ceases as soon as that process stops. He taught also that warmth and cold arise from mere rarefaction and condensation, and gave as a proof the fact that when we breathe with the lips drawn together the air is cold, but it becomes warm when we breathe through the widely-opened mouth. Hence he concluded that, with a sufficient rarefaction, air might turn into fire, and that this probably was the origin of the sun and stars, blazing comets, and other meteors; but if by chance it should undergo condensation, it would turn into wind and clouds, or, if that operation should be still more increased, into water, snow, hail, and, at last, even into earth itself. And since it is seen from the results of breathing that the air is a