We have seen the maternal instinct in the making, and we have come to understand the strong force of this impulse, which finds its expression in so many diverse ways. There is much that we cannot understand. But this is largely because we know so little. We have, I hope, gained a clearer view; we have learnt many things that may cast forward suggestions for the solving of our own sexual, domestic and social relationships. The facts which I have recorded are, I trust, sufficient for this purpose: I hold that the following general conclusions may be drawn from them— Regarding the care of the young as the moving force in developing the intelligence of the parents, I have accepted the truth, which it is the chief purpose of my book to make plain, that the individual exists for the race. Other personal things may be important, they may be profoundly important, but they are not primary—not one with the forces that do not change. The individual is primarily the host and servant of the seed of life. Birth is the essential fact underlying all experience. From this service to the future arises the family and the home. And with the appearance of the family, new habits are necessarily formed, and these act in developing the higher sides of mental and emotional life. Co-operation, friendship and love which is not sexual attraction find their first beginnings in the limiting by the parents of their desire to look after themselves, to satisfy their own appetites and provide for their own needs. The mere toleration of the young is the start in a new life. There follows a mutual joining in work with the necessity and opportunity of modifying instinct by practice. In this way a direct push forward is given for the development of intelligent conduct. An immense advance, then, is gained from the association of the young with the old in the family tie. In the cases we have examined, we have seen that the same end is not gained always in the same way. Nature has no fixed rule for the family. The contrasts and paradoxes of animal family life are numerous. We have watched the development of the parental intelligence in many family groups; we have seen that there is no fixed order in the relations which exist between parents and offspring. All arrangements are good on the one condition that they succeed in serving the family and preserving its life.