He had also a conception of the gradual development on the earth of higher and higher forms of life, the first being rude and imperfect, and a 'struggle for existence' ensuing in which the monstrous and the deficient gradually were eliminated--the "two-faced, the double-breasted, the oxen-shaped with human prows, or human-shaped with head of ox, or hemaphrodite," and so forth. Love and Strife worked out their ends upon these varied forms; some procreated and reproduced after their image, others were incapable of reproduction from mere monstrosity or [138] weakness, and disappeared. Something other than mere chance thus governed the development of things; there was a law, a reason, a _Logos_ governing the process. This law or reason he perhaps fancifully illustrated by attributing the different characters of flesh and sinew and bone to the different numerical proportions, in which they severally contain the different elements. On this Aristotle, keen-scented critic as he was, has a question, or series of questions, to ask as to the relation between this Logos, or principle of orderly combination, and Love as the ruling force in all unions of things. "Is Love," he asks, "a cause of mixtures of any sort, or only of such sorts as Logos dictates? And whether then is Love identical with this Logos, or are they separate and distinct; and if so, what settles their separate functions?" Questions {71} which Empedocles did not answer, and perhaps would not have tried to answer had he heard them. [139] The soul or life-principle in man Empedocles regarded as an ordered composite of all the elements or principles of the life in nature, and in this kinship of the elements in man and the elements in nature he found a rationale of our powers of perception. "By the earth," said he, "we have perception of earth; by water we have perception of water; of the divine aether, by aether; of destructive fire, by fire; of love, by love; of strife, by strife." He therefore, as Aristotle observes, drew no radical distinction between sense-apprehension and thought. He located the faculty of apprehension more specifically in the blood, conceiving that in it the combination of the elements was most complete. And the variety of apprehensive gift in different persons he attributed to the greater or lesser perfectness of this blood mixture in them individually. Those that were dull and stupid had a relative deficiency of the lighter and more invisible elements; those that were quick and impulsive had a relatively larger proportion of these. Again, specific faculties depended on local perfection of mixture in certain organs; orators having this perfectness in their tongues, cunning craftsmen possessing it in their hands, and so on. And the degrees of capacity of sensation, which he found in various animals, or even plants, he explained in similar fashion.