In the gathering of food and the making of protective war, many animals are the rivals in instinct and intelligence of primitive man. Continued development in that regard might have produced a race of men “formidable among animals through sheer force of sharp-wittedness,” but not _homo sapiens_. In the passage from animality to humanity, there was not only mental evolution, but moral, and the developing mind would naturally exercise itself for days and years, and perhaps for long periods around that one emotion—the love of the female for its young—an emotion he was incapable of understanding, but the outward manifestations of which he would be bound to imitate. Whether man was led to an understanding of the maternal affections by the “sensuous aspects of the newly-born progeny” appealing to man himself,[1] or through pity and sympathy, as Spencer suggests, or still more through imitation of the maternal delight, he undoubtedly would be led to a higher mental plane as he slowly came to understand that the maternal affection was not self-gratifying in the sense that marked the entire gamut of his own emotions up to that time. Even in recent times tribes have been found so low in the social scale that coition and child-birth have been assumed to have no relation, the latter phenomenon being explained by ascribing to certain trees the power to make women fructile. In a society as low in mentality as this, it would be easy to conceive that the woman’s unselfishness—her lack of the self-gratifying impulse—in protecting, nursing, and rearing a burden superimposed on her with no pleasurable antecedents, would be even more amazing than it would be to the male living in a state sufficiently advanced to understand the reproductive function. In either state of society, there then begins in the human consciousness a disturbance “which is significant of something having another value than that of mere pleasure, and which is pregnant with the promise of another than the merely sensuous or merely intellectual life.”[2] The words quoted are Prof. Ladd’s, discussing the philosophy of conduct of civilized man—but here, even in the primitive man, the rule applies—the moral idea is born, legitimately enough, out of the altruistic maternal affection.