The motions are of [several] natures, of which the first is called temporal, because it deals only with the movement of time, and this embraces in itself all the others. The second is that of the life of things. The third is called mental, and this resides in animate bodies. The fourth is that of the species of things, which spread through the air by straight lines; this seems not to be subject to time, because it is made in indivisible time, and that thing which cannot be divided by the mind is not found among us. The fifth is that of sounds that go through the air, and this is slower, and so of odours and tastes; and this we shall call sensual motion, the other being called corporeal, of which we shall make our treatise. But we shall say only that motions are of 2 natures, of which one is material and the other spiritual, because it is not comprehended by the sense of sight; or we shall say that one is visible and the other invisible, although among the invisible there are many material motions, such as the motion of Saturn and as would occur in multiplied wheels. Whence we shall say the two motions are thus: that one is that which is joined to bodies and the other to the spirit. But among the motions, that of the likenesses of things through the air is the fastest, because it is made very long in the same time as very short, and this is lost by distance, because the air thickens. The second is that of the mind. Of the motion of the senses we shall make no mention except of hearing, because it is applied to visible bodies and is made with time, as is shown in noises, thunders, sounds and voices. Of smell, taste and touch we shall not speak, as not being to our purpose. One may still speak of the influences of the planets and of God. Of the motion from white to red, that is, of colours.