The care and shelter of the young is a far larger problem with us than with our hairy ancestors. Our longer period of immaturity gives us monogamous marriage and the permanent home. The animal may change his mate and home between litters; ours lap. This over-lapping, long-continuing babyhood has given us more good than we yet recognise. Thus we see that all the animal cared for in the home we have in greater degree, and care for more; while we have, further, many home ideals they knew not. One of the earliest steps in human development was ancestor-worship. With lower animals the parents do their duty cheerfully, steadily, devotedly, but there is no thought of return. The law of reproduction acts to improve the race by relentlessly sacrificing the individual, and that individual, the parent, never sets up a claim to any special veneration or gratitude. But with us it is different. Our little ones lasting longer and requiring more care, we become more conscious of our relation to them. So the primitive parent very soon set up a claim upon the child, and as the child was absolutely helpless and in the power of the parent, it did not take long to force into the racial mind this great back-acting theory. The extreme height is found where it is made a religion, ancestor-worship, once very common, and still dominant in some of our oldest, _i.e._, most primitive civilisations, as the Chinese. This ancestor-worship is what gave the element of sanctity to the home. As late as the Roman civilisation its power was so strong that the home was still a temple to a dwindling group of household gods--mere fossil grandpas--and we ourselves are not yet free from the influence of Roman civilisation. We still talk in poetic archaisms of "the altar of the home." The extension of the family from a temporary reproductive group to a permanent social group is another human addition to the home idea. To have lived in one hole all his infancy makes that hole familiar and dear to the little fox. To have lived in one nest all his life makes that nest more familiar and more dear to the rook. But to have lived in one house for generations, to have "the home of my ancestors" loom upon one's growing consciousness--this is to enlarge enormously our sense of the dignity and value of the term.