For, it being manifest that there are bodies and good store of bodies, each whereof are so small, that we cannot by any of our senses discover either their bulk, figure, or motion, as is evident in the particles of the air and water, and others extremely smaller than those; perhaps as much smaller than the particles of air and water, as the particles of air and water are smaller than peas or hail stones; let us suppose at present that, the different motions and figures, bulk and number, of such particles, affecting the several organs of our senses, produce: in us those different sensations which we have from the colours and smells of bodies;.g.