ANATOMY. 269
thing–in–itself is in question. Not only with respect to the points here mentioned, but to many others besides, the mechanical instincts and physiological functions of animals serve to explain each other mutually, because the will without knowledge is the agent in both.
As the will has equipped itself with every organ and every weapon, offensive as well as defensive, so has it like wise provided itself in every animal shape with an intellect, as a means of preservation for the individual and the species. It was precisely in this account that the ancients called the intellect the ηγεμονικον, i.e. the guide and leader. Accordingly the intellect, being exclusively destined to serve the will, always exactly corresponds to it. Beasts of prey stood in greater need of intellect, and in fact have more intelligence, than herbivorous animals. The elephant certainly forms an exception, and so does even the horse to a certain extent; but the admirable intelligence of the elephant was necessary on account of the length of its life (200 years) and of the scantiness of its progeny, which obliged it to provide for a longer and surer preservation of the individual: and this moreover in countries teeming with the most rapacious, the strongest and the nimblest beasts of prey. The horse too has a longer life and a scantier progeny than the ruminants, and as it has neither horns, tusks, trunk, nor indeed any weapon save perhaps its hoofs, it needed greater intelligence and swiftness in order to elude pursuit. Monkeys needed their extraordinary intelligence, partly because of the length of their life, which even in the moderate-sized animal extends to fifty years; partly also because of their scanty progeny, which is limited to one at a time, but especially because of their hands, which, to be properly used, required the direction of an understanding. For monkeys depend upon their hands, not only for their defence by means of outer weapons such as sticks and stones, but also for their
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