In a subject that is constantly confused by partisanship it is important to make no greater claims for an argument than the facts absolutely warrant. Accordingly, I hasten to explain what has really been shown and what I have failed to show hitherto. It is, I think, fair to say that culture cannot be adequately explained by race, and that the same race varies extraordinarily in culture even within a very narrow space of time. But we have not furnished proof that, say, the Central African Pygmies, the Tasmanians, or the aborigines of Australia would have been capable of attaining unaided to the level of our civilization. What we can say, however, is this: The Chinese and some of our American Indians, such as the ancient Central Americans and Peruvians, did attain a very high level, which may be equated with that of Europe at a relatively recent period. The difference between European culture then and now cannot be due to hereditary causes, and it would, therefore, be unjustifiable to allege that such causes account for the difference between Europe of today and China or ancient Central America. Quite generally it is true that the so-called primitive tribes are anything but primitive in the strict sense of the term. Ingenious contrivances, such as the boomerang, occur among the Australians, usually regarded as one of the lowliest of races, and here we also find a remarkable complexity of social organization. The Negroes of Africa are not only conversant with the art of metallurgy, which is possibly their own invention, but are conspicuous for their ability to form large and powerful political states and have shown at least the ability of assimilating the culture of Islam. If we contrast Negro culture on the average not with the highest products of Dutch, Danish, or Swiss culture, but with the status of the illiterate peasant communities in not a few regions of Europe, the difference will hardly be so great as to suggest any far-reaching hereditary causes. As the highly civilized Manchu of today have for their next racial kin very crude Siberian populations, so the white race, even today, embraces very primitive as well as highly advanced constituent groups. We cannot wholly isolate the racial factor from others, and we cannot give an ocular demonstration of what the several inferior races, so-called, are capable of achieving under the most favorable conditions. But with great confidence we can say that since the same race at different times or in different subdivisions at the same time represents vastly different cultural stages, there is obviously no direct _proportional_ relation between culture and race. And if great changes of culture can occur without any change of race whatsoever, we are justified in considering it probable that a relatively minute change of hereditary ability might produce enormous differences. An analogy may render the matter clearer. Suppose that it is of vital importance to lift a heavy weight, say 400 pounds,