[151] [cap.30] And a very similar effect is seen in the different parts of animals and especially of men. For hand is equal to hand, and foot to foot, and nearly all the other limbs of the body are equal to their corresponding members in magnitude, those on the left hand being equal to those on the right. And there are an exceeding number of things which are equal to one another in power, both among wet things and dry things, the judgment on which is seen in measures and scales, and things of that kind.