6. As the form of the organ is, such is the form of the sensation. If the organ be a substance, and the sensation a modification, and if no sensation be possible without an organic form, it follows that the substantial form, or that of the sensory, must coincide with the form of the modification or that of the sensation. Form can be predicated both of substance and of forces and modifications; for form is constituted of essential determinations, and these determinations cannot be conceived of without an idea of the co-existence or fluxion of individuals. If these latter are acted upon, there results a form of modification which must needs be like the form of the substances which are in determinate fluxion. Therefore, as the form of the eye is, such is the sight; as the form of the ear, such the hearing; and also as the form of the cortical gland, such is the perception and imagination, and so forth. Thus, when the organ is changed, the sense which results therefrom is changed conformably. But as to the nature of the form of each organ and of the sensation resulting therefrom, to inquire into this is too long an undertaking. The form of the eye and of sight is more perfect than the form of the ear and hearing; while the form of the cortical gland, that is, of the internal sight is more perfect than the form of the eye, that is, of the external sight. Thus perfections of organic forms increase and are elevated by degrees even to the soul itself, which is the form of forms of its body, or the informer of them all. These more perfect forms are also called superior, prior, simpler, and more internal.
