The first answer to this argument is the fact that the animal having preceded man is not a proof of the evolution, change and alteration of the species, nor that man was raised from the animal world to the human world. For while the individual appearance of these different beings is certain, it is possible that man came into existence after the animal. So when we examine the vegetable kingdom, we see that the fruits of the different trees do not arrive at maturity at one time; on the contrary, some come first and others afterward. This priority does not prove that the later fruit of one tree was produced from the earlier fruit of another tree. Second, these slight signs and traces of members have perhaps a great reason of which the mind is not yet cognizant. How many things exist of which we do not yet know the reason! So the science of physiology—that is to say, the knowledge of the composition of the members—records that the reason and cause of the difference in the colors of animals, and of the hair of men, of the redness of the lips, and of the variety of the colors of birds, is still unknown; it is secret and hidden. But it is known that the pupil of the eye is black so as to attract the rays of the sun, for if it were another color—that is, uniformly white—it would not attract the rays of the sun. Therefore, as the reason of the things we have mentioned is unknown, it is possible that the reason and the wisdom of these traces of members, whether they be in the animal or man, are equally unknown. Certainly there is a reason, even though it is not known.