ABSTRACT
Many animals have survived owing to a specialization of the organs which are used for getting food. It is clear that the tongue of the ant-eater helps him to obtain his food, which might otherwise be difficult to reach. The physical perfection of the cats has been the subject of admiration among many naturalists, and has enabled the larger varieties to attain a supremacy which is unchallenged except by man. The most primitive men, however, whom we know in any detail had specialized in a way which divides them very dearly from the apes. In dealing with the problem of the reaction of labour on various races we are on uncertain ground. Man as a race, and as an individual, has been able to adapt himself to and to triumph over his environment in a way that no other animal has succeeded in doing.
