The national aspect of eugenics suggests its international aspect, and its inter-racial aspect. Not having spent six weeks rushing through the United States, I am unfortunately dubious as to the worth of any opinions I may possess regarding the most urgent form of this question to-day. I mistrust not merely the brilliant students who, unhampered by biological knowledge, pierce to the bottom of this question in the course of such a tour, but also the humanitarian bias of those who, like M. Finot, or the distinguished American sociologist, Mr. Graham Brooks, would almost have us believe that the negro is mentally and morally the equal of the Caucasian. Least of all does one trust the vulgar opinions of the man in the street. Wisdom on this matter waits for the advent of real knowledge. Similarly in the matter of Caucasian-Mongolian unions. I question whether any living man knows enough to warrant the expression of any decided opinion on this subject. Merely I here recognise miscegenation in general as a problem in eugenics, to which increasing attention must yearly be devoted. But it would have been ridiculous to attempt to deal with that great subject here. As for the marriage of cousins, to take the opposite case, I always reply to the question, “Should cousins marry?” that it depends upon the cousins. The good qualities of a good stock, the bad qualities of a bad stock, are naturally accentuated by such unions: I doubt whether there is much more to be said about them. * * * * *