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248 called Orphic verse was the invention of Cercops, a Pythagorean; yet Orpheus, that is to say, the image of him, as you will have it, often runs in my head. What is the reason that I entertain one idea of the figure of the same person, and you another? Why do we image to ourselves such things as never had any existence, and which never can have, such as Scyllas and Chimæras? Why do we frame ideas of men, countries, and cities which we never saw? How is it that the very first moment that I choose I can form representations of them in my mind? How is it that they come to me, even in my sleep, without being called or sought after?

XXXIX. The whole affair, Velleius, is ridiculous. You do not impose images on our eyes only, but on our minds. Such is the privilege which you have assumed of talking nonsense with impunity. But there is, you say, a transition of images flowing on in great crowds in such a way that out of many some one at least must be perceived! I should be ashamed of my incapacity to understand this if you, who assert it, could comprehend it yourselves; for how do you prove that these images are continued in uninterrupted motion? Or, if uninterrupted, still how do you prove them to be eternal? There is a constant supply, you say, of innumerable atoms. But must they, for that reason, be all eternal? To elude this, you have recourse to equilibration (for so, with your leave, I will call your ), and say that as there is a sort of nature mortal, so there must also be a sort which is immortal. By the same rule, as there are men mortal, there are men immortal; and as some arise from the earth, some must arise from the water also; and as there are causes which destroy, there must likewise be causes which preserve. Be it as you say; but let those causes preserve which have existence themselves. I cannot conceive these your Gods to have any. But how does all this face of things arise from atomic corpuscles? Were there any such atoms (as there