hold that the earth is flat and that the sun goes round it; but no sensible man will waste time in the vain attempt to convince such persons of their error, even though these flatteners of the earth and circulators of the sun appeal with perfect justice to the evidence of their senses in support of their hallucination, which is more than the opponents of man’s primitive savagery are able to do. [Sidenote: Hence a study of savagery essential to an understanding of the evolution of humanity.] Thus the study of savage life is a very important part of Social Anthropology. For by comparison with civilized man the savage represents an arrested or rather retarded stage of social development, and an examination of his customs and beliefs accordingly supplies the same sort of evidence of the evolution of the human mind that an examination of the embryo supplies of the evolution of the human body. To put it otherwise, a savage is to a civilized man as a child is to an adult; and just as the gradual growth of intelligence in a child corresponds to, and in a sense recapitulates, the gradual growth of intelligence in the species, so a study of savage society at various stages of evolution enables us to follow approximately, though of {163} course not exactly, the road by which the ancestors of the higher races must have travelled in their progress upward through barbarism to civilization. In short, savagery is the primitive condition of mankind, and if we would understand what primitive man was we must know what the savage now is.