Be it remembered how doubtful and tainted is the bulk of our evidence in these matters. These are extraordinarily subtle inquiries, from which few men succeed in disentangling the threads of their personal associations--the curiously interwoven strands of self-love and self-interest that affect their inquiries. One might almost say that instinct fights against such investigations, as it does undoubtedly against many necessary medical researches. But while a long special training, a high tradition and the possibility of reward and distinction, enable the medical student to face many tasks that are at once undignified and physically repulsive, the people from whom we get our anthropological information are rarely men of more than average intelligence, and of no mental training at all. And the problems are far more elusive. It surely needs at least the gifts and training of a first-class novelist, combined with a sedulous patience that probably cannot be hoped for in combination with these, to gauge the all-round differences between man and man. Even where there are no barriers of language and colour, understanding may be nearly impossible. How few educated people seem to understand the servant class in England, or the working men! Except for Mr. Bart Kennedy's A Man Adrift, I know of scarcely any book that shows a really sympathetic and living understanding of the navvy, the longshore sailor man, the rough chap of our own race. Caricatures, luridly tragic or gaily comic, in which the misconceptions of the author blend with the preconceptions of the reader and achieve success, are, of course, common enough. And then consider the sort of people who pronounce judgments on the moral and intellectual capacity of the negro, the Malay, or the Chinaman. You have missionaries, native schoolmasters, employers of coolies, traders, simple downright men, who scarcely suspect the existence of any sources of error in their verdicts, who are incapable of understanding the difference between what is innate and what is acquired, much less of distinguishing them in their interplay. Now and then one seems to have a glimpse of something really living--in Mary Kingsley's buoyant work, for instance--and even that may be no more than my illusion.