Nothing is more valuable in the foundation of an education than the faculty and habit of observation--the power of noting understandingly, or at least inquiringly, what happens within our sight and hearing. To go about with one's eyes half shut, content to see the curtain and never curious to look at the play on nature's stage behind it, is to miss a very large part of the possible pleasure in life. That his child should not suffer this loss ought to be the concern of every parent. Little more than encouragement and some opportunity is needed to preserve and cultivate this disposition and faculty. Direct a youngster's attention to some common fact of woodland life new to him, and his interest and imagination will be excited to learn more. Give him a hint of the relationship of this fact to other facts, and you have started him on a scientific search, and he has begun to train his eye and his mind without knowing it. At this point such books as this are extremely helpful, and lead to a desire for the more special treatises which happily are now everywhere accessible. This suggestion is not made with the idea that every youngster is to become a full-fledged naturalist; but with the sense that some knowledge of nature will be a source of delight throughout life; and with the certainty that in no direction can quickness of eye and accuracy of sight and reasoning be so well and easily acquired. These are qualities which make for success in all lines of human activity, and therefore are to be regarded as among the most important to be acquired early in life. The physical benefit of an interest in animal life, which leads to outdoor exercise, needs no argument. The mental value has been touched upon. The moral importance is in the sense of truth which nature inculcates, and the kindliness sure to follow the affectionate interest with which the young naturalist must regard all living things. No matter what is to be their walk in life, the observing study of nature should be regarded as the corner-stone of a boy's or girl's education. ERNEST INGERSOLL MAMMALS CHAPTER I APES AND GIBBONS First among the mammals come the monkeys. First among the monkeys come the apes. And first among the apes come the chimpanzees, almost the largest of all monkeys. CHIMPANZEES When it is fully grown a male chimpanzee stands nearly five feet high. And it would be even taller still if only it could stand upright.