When we study modern biology we begin to wonder about the "origin of man; and even if the missing link between man and monkey were to be found, we should still not have probed the depths of human origin. If such is the character and nature of things on the surface, how can we stamp them with names which we invent from our limited knowledge of them? The deeper we go into things, the less we shall think we can call them so and so, or such and such. Everything in the world is under a cover, and when it is uncovered there is another cover; so one thing is found inside the other thing, and one cannot get at the bottom of things unless one knows the secret of how to get there. It is for this reason that the learned of this world, who study and study all their lives, go only so far and no further. We may ask the most learned man in the world, who has perhaps propounded a thousand theories, what is at the bottom of it all, and he will answer, "I do not know, but I would like to know if I could.'