In order to finish this last addendum in a useful way, I beg the reader to review in his mind what I have said of the admirable art that appears in the construction of the eyes, of the relation they have to the properties of light, of their connection with the brain and through the brain with the rest of the body, ofthe simplicity of the general law that developed them and gradually led them to their present state, and finally, of the use that God according to the laws concerning the union of the soul and body makes of them, at each moment and in all men.