But this is not tenable, as we have reason to think, from the interaction which actually takes place between physical and social heredity. To be sure, the heredity of the individual is a physiological matter, in the sense that the son must inherit from his parents and their ancestors alone. But granted that two certain parents are his parents, we may ask how these two certain parents came to be his parents. How did his father come to marry his mother, and the reverse? This is distinctly a social question; and to its solution all the currents of social influence and suggestion contribute. Who is free from social considerations in selecting his wife? Does the coachman have an equal chance to get the heiress, or the blacksmith the clergyman's daughter? Do we find inroads made in Newport society by the ranchman and the dry-goods clerk? And are not the inroads which we do find, the inroads made by the counts and the marquises, due to influences which are quite social and psychological? Again, on the other hand, what leads the count and the marquis, to lay their titles at Newport doors, while the ranchman and the dry-goods clerk keep away, but the ability of both these types of suitors to estimate their chances just on social and psychological grounds? Novelists have rung the changes on this intrusion of social influences into the course of physical heredity. Bourget's Cosmopolis is a picture of the influence of social race characteristics on natural heredity, with the reaction of natural heredity again upon the new social conditions. A speech of a character of Balzac's is to the point, as illustrating a certain appreciation of these social considerations which we all to a degree entertain. The Duchesse de Carigliano says to Madame de Sommervieux: "I know the world too well, my dear, to abandon myself to the discretion of a too superior man. You should know that one may allow them to court one, but marry them--that is a mistake! Never--no, no. It is like wanting to find pleasure in inspecting the machinery of the opera instead of sitting in a box to enjoy its brilliant illusions." To be sure, we do not generally deliberate in this wise when we fall in love; but that is not necessary, since our social environment sets the style by the kind of intangible deliberation which I have called judgment and fitness. Suppose a large number of Northern advocates of social equality should migrate to the Southern United States, and, true to their theory, intermarry with the blacks. Would it not then be true that a social theory had run athwart the course of physiological descent, leading to the production of a legitimate mulatto society? A new race might spring from such a purely psychological or social initiation.