That of all relationships the one between mother and child is the most intimate is obvious. The child is part and parcel of the mother: her own flesh and blood and soul; and in loving it the mother practically loves a detached portion of herself—thus uniting the force of selfish with that of altruistic emotion. This is the primitive fountain of maternal affection. A second source of it lies in the resemblance of the child to the father, reviving in the mother’s memory the romantic days of pre-matrimonial Love. It must be an unending source of interest in a mother’s mind to note which of the child’s traits are derived from her, which from the father. If she loves herself, and loves her husband, the child that unites the traits of both must be doubly dear to her. The fact that the child is inseparably associated with all the mother’s joys and sorrows, from the wedding-day to death, constitutes a third source of her attachment; and a fourth is the social regard and honour which an energetic and gifted son, or a beautiful and accomplished daughter, may reflect on her. The mother herself is of course unconscious of the complex nature of her feeling and its origin; especially in the first days, when the new feeling dawns upon her like a revelation. As in the case of budding Love, the feeling is at first less individual than generic—less the affection of this particular mother for this particular child than the bursting out of the general feeling of motherhood, inherited by her in common with all women. Natural selection helps us to explain how this general feeling of motherhood was developed. As among animals, so among our savage and semi-civilised ancestors, those mothers who fondly cared for their infants naturally succeeded in rearing a larger and more vigorous progeny than those mothers who neglected their children. And through hereditary transmission this instinct gradually acquired, that marvellous intensity and power which we now admire. The sublime and almost terrible height to which this emotion can rise is most realistically depicted in Rubens’s famous picture in Munich, representing the murder of the children at Bethlehem; in which mothers grasp the naked daggers, and frantically expose their breasts to receive the blows intended for their little ones. Throughout the animal kingdom, including mankind, the female is less pugnacious than the male, less provided with means of defence, and hence more gentle and timid; yet in the moment of peril the mother’s affection absolutely annihilates fear, and makes her face danger and death with a courage, supernatural strength, and endurance, rarely equalled by man, with all his weapons and natural consciousness of superior muscle. It is in this blind, impetuous, passionate willingness of self-sacrifice that maternal affection most closely resembles the passion of Romantic Love. III.—PATERNAL LOVE