For the preservation of species, two rôles are essential: the Male rôle of Combat, demanding strength and boldness, resource and fighting-quality, in order to protect and provide for the female and offspring; and the Female rôle of Devotion and Self-surrender, in order to nurture offspring ante-natally, and, after birth, to nurture and to tend its helplessness. Now all but biologists, perhaps, take it as matter-of-course that Love had its origin in Sex. Seeing love between the sexes as the strongest and most dominant of the civilised passions, it is natural to infer that it was born of the instinctive attraction between male and female, and that this instinctive attraction, with the growth and expansion of faculty, mental and temperamental, has evolved to the high and tender issues to be found in latter-day romantic passion; theme of poets, novelists, artists; richest and most exquisite of life's emotions; inspiration and motive of the finest human achievements. A passion which, for a space at least, transfigures the natures and ennobles the lives of all but the crass and the sordid. Nevertheless--Love did not arise out of sex. The sex-relation in primal men and women held no element of affection; no sympathy, tenderness, self-sacrifice, or other attribute of Love. On the part of the female, it was compulsory surrender and the habit of surrender to superior strength, mitigated, doubtless, by a subconscious instinct to secure offspring. In the male, it was impulse as tyrannous and selfish as was the instinct to kill. Like the instinct to kill, a factor in it made for fitness for survival. There was in it, accordingly, an element of instinctive selection. But the selection made for survival-fitness merely in the mate. It owed nothing to sentimental appeal exercised by one female, and lacking in another. The instinct to mate was implanted by Nature for the continuation of species. If its observance contained an element of gratification, it held no more of reciprocity than did the gratification of that stronger lust, to kill, include a consideration of the feelings of the prey, or than greed of any other form of possession extends a grace of reciprocal benefit to the thing acquired. Modern savages have no conception of sexual love. There are no love-songs, no courtship, no affection in their matings. The males marry mainly in order to secure wives to work for them. And they select strong women because these are best fitted for work. Or they select women who have some or another small possession. Biological instinct is a factor, doubtless, but it is not a factor of sentiment. In his fine book, _Natural Law in the Spiritual World_, Professor Drummond says: