however short the distance to which it rebounds, when it finds itself imprisoned in a mass of entangling atoms. Of all this there is no beginning, since both atoms and void exist from everlasting. [He says below that atoms have no quality at all except shape, sice, and freight. But that colour varies with the arrangement of the atoms he states in his " Twelve Rudiments " ; further, that they are not of any and every size ; at any rate no atom has ever been seen by our sense.] " The repetition at such length of all that we are now recalling to mind furnishes an adequate outline for our conception of the nature of things. •• Moreover, there is an infinite number of worlds, vi ime like this world, others unlike it. a For the atoms being infinite in number, as has just been proved, are borne ever further in their course. For the atoms out of which a world might arise, or by which a world might be formed, have not all been expended on one world or a finite number of worlds, whether like or unlike this one. Hence there will be nothing to hinder an infinity of worlds. " Again, there are outlines or films, which are of the same shape as solid bodies, but of a thinness far exceeding that of any object that we see. For it is not impossible that there should be found in the surrounding air combinations of this kind, materials adapted for expressing the hollowness and thinness of surfaces, and effluxes preserving the same relative position and motion which they had in the solid objects from which they come. To these films we give the name of ' images ' or ' idols.' Further-