We must mention another law before going further. Crossing of blood does not merely imply the fusion of the two varieties, but also creates new characteristics, which henceforth furnish the most important standpoint from which to consider any particular sub-species. Examples will be given later; meanwhile I need hardly say that these new and original qualities cannot be completely developed unless there has previously been a perfect fusion of the parent-types; otherwise the tertiary race cannot be considered as really established. The larger the two nations are, the greater will naturally be the time required for their fusion. But until the process is complete, and a state of physiological identity brought about, no new sub-species will be possible, as there is no question of normal development from an original, though composite source, but merely of the confusion and disorder that are always engendered from the imperfect mixture of elements which are naturally foreign to each other. Our actual knowledge of the life of these tertiary races is very slight. Only in the misty beginnings of human history can we catch a glimpse, in certain places, of the white race when it was still in this stage—a stage which seems to have been everywhere short-lived. The civilizing instincts of these chosen peoples were continually forcing them to mix their blood with that of others. As for the black and yellow types, they are mere savages in the tertiary stage, and have no history at all.[94] To the tertiary races succeed others, which I will call “quaternary.” The Polynesians, sprung from the mixture of black and yellow,[95] the mulattoes, a blend of white and black,—these are among the peoples belonging to the quaternary type. I need hardly say, once more, that the new type brings the characteristics peculiar to itself more or less into harmony with those which recall its twofold descent.