All the higher animals possess in some degree the powers of memory, judgment, and choice; but in man nature followed the plan of developing enormously the memory, on which depend abstraction, or the power of general ideas, and the reason. In order to secure this result, the brain, or surface for recording experience, was developed out of all proportion with the body. In the average European the brain weighs about 1,360 grams, or 3 per cent. of the body weight, while the average brain weight of some of the great anthropoid apes is only about 360 grams, or, in the orangoutang, one-half of 1 per cent. of the body weight. In point of fact, nature seems to have reached the limit of her materials in creating the human species. The development of hands freed from locomotion and a brain out of proportion to bodily weight are _tours de force_, and, so to speak, an afterthought, which put the heaviest strain possible on the materials employed, and even diverted some organs from their original design. A number of ailments like hernia, appendicitis, and uterine displacement, are due to the fact that the erect posture assumed when the hands were diverted from locomotion to prehensile uses put a strain not originally contemplated on certain tissues and organs. Similarly, the proportion of idiocy and insanity in the human species shows that nature had reached the limit of elasticity in her materials and began to take great risks. The brain is a delicate and elaborate organ on the structural side, and in these cases it is not put together properly, or it gets hopelessly out of order. This strain on the materials is evident in all races and in both sexes, and indicates that the same general structural ground-pattern has been followed in all members of the species. Viewed from the standpoint of brain weight, all races are, broadly speaking, in the same class. For while the relatively small series of brains from the black race examined by anthropologists shows a slight inferiority in weight--about 45 grams in negroes--when compared with white brains, the yellow race shows more than a corresponding superiority to the white; in the Chinese about 70 grams. There is also apparently no superiority in brain weight in modern over ancient times. The cranial capacity of Europeans between the eleventh and eighteenth centuries, as shown by the cemeteries of Paris, is not appreciably different from that of Frenchmen of today, and the Egyptian mummies show larger cranial capacity than the modern Egyptians. Furthermore, the limits of variation between individuals in the same race are wider than the average difference between races. In a series of 500 white brains, the lowest and highest brains will differ, in fact, as much as 650 grams in weight.