It is our conviction that if souls were visible to the eyes, we should be able to see distinctly that strange thing that each one individual of the human race corresponds to some one of the species of the animal creation; and we could easily recognize this truth, hardly perceived by the thinker, that from the oyster to the eagle, from the pig to the tiger, all animals exist in man, and that each one of them is in a man. Sometimes even several of them at a time.