THE PSYCHOLOGY OF RACE-PREJUDICE 595
the determination of the steps of the process by which man mentally allied with himself certain portions of his environment to the exclusion others.
When we come to examine in detail the process by which an associational and sympathetic relation is set up between the individual and certain parts of the outside world to the exclusion of others, we find this at first on a purely instinctive and reflex basis, originating in connection with food-getting and reproduc- tion, and growing more conscious in the higher forms' of life. One of the most important origins of association and preposses- sion is seen in the relation of parents, particularly of mothers, to children. This begins, of course, among the lower animals. The mammalian class, in particular, is distinguished by the strength and persistence of the devotion of parents to offspring. The advantage secured by the form of reproduction characteristic of man and the other mammals is that a closer connection is secured between the child and the mother. By the intra-uterine form of reproduction the association of mother and offspring is set up in an organic way before the birth of the latter, and is continued and put on a social basis during the period of lactation and the early helpless years of the child. By continuing the helpless period of the young for a period of years, nature has made provision on the time side for a complex physical and mental type, impossible in types thrown at birth on their own resources. Along with the structural modification of the female on account of the intra-uterine form of reproduction and the effort of nature to secure a more complex type and a better chance of survival, there is a corresponding development of the sentiments, and maternal feeling, in particular, is developed as the subjective condition necessary to carrying out the plan of giving the infant a prolonged period of helplessness and play through which its faculties are developed. The scheme would not work if the mother were not more interested in the child than in anything else in the world. In the course of develop- ment every variational tendency in mothers to dote on their children was rewarded by the survival of these children, and the consequent survival of the stock, owing to better nutrition, p*o-
