Authors differ widely as to the results of the crossing of human races and subraces. Some assert that the effect of crossing of races is always bad, that the cross-bred progeny is always inferior to the parent stocks. They make no allowance for unfavourable conditions, especially the lack of the strong moral traditions of old organised societies. Others maintain the opposite opinion. Both opinions are probably correct in a certain sense. I think the facts enable us to make with some confidence the following generalisation. The crossing of the most widely different stocks, stocks belonging to any two of the four main races of man, produces an inferior race; but the crossing of stocks belonging to the same principal race, and especially the crossing of closely allied stocks, generally produces a blended subrace superior to the mean of the two parental stocks, or at least not inferior. This generalisation cannot yet be based on exact and firmly established data, unfortunately; but it is in harmony with old established popular beliefs, and with what we know of the crossing of animal breeds; and it is borne out by a general inspection of many examples. For instance, the blending of the white, negro, and American stocks, which has been going on in South America for some centuries, seems to have resulted in a subrace which up to the present time is inferior to the parent races; or at any rate to the white race. So the mulattoes of North America and the West Indies, although superior in some respects to the pure negroes, seem deficient in vitality and fertility, and the race does not maintain itself. The Eurasians of India are commonly said to be a comparatively feeble people. The blend of the Caucasian with the yellow race is also generally of a poor type. Examples abound in Java of people of mixed Javanese and Dutch blood; and they are for the most part feeble specimens of humanity. It is generally recognised that a recently blended stock may produce a few individuals of exceptional vigour and capacity and physical beauty. But setting these aside, the blended stock seems to be inferior in two respects: (1) a general lack of vigour, which expresses itself in lack of power of resistance to many diseases and in relative infertility; so that the blended stock can hardly maintain its numbers; (2) a lack of harmony of qualities, both mental and physical. It may be that such lack of harmony is the ground of the relative infertility of blended stocks. It expresses itself in the inharmonious combination of physical features, characteristic of the mongrel. The negro race has a beauty of its own, which is spoilt by blending.