In his Romanes Lecture of June 7, 1902, on "The Relations of the Advanced and the Backward Races of Mankind," Mr. Bryce says (p. 24): "Where two races are physiologically near to one another, the result of intermixture is good. Where they are remote, it is less satisfactory, by which I mean not only that it is below the level of the higher stock, but that it is not generally and evidently better than the lower stock.... But the mixture of whites and negroes, or of whites and Hindus, or of the American aborigines and negroes, seldom shows good results. The hybrid stocks, if not inferior in physical strength to either of those whence they spring, are apparently less persistent, and might--so at least some observers hold--die out if they did not marry back into one or other of the parent races. Usually, of course, they marry back into the lower." (_N.B._ Mr. Bryce, it appears, is so "provincial, unintelligent and unchristian" as to assume that the Whites are superior--a higher stock, and the Negroes inferior--a lower stock!) Again, p. 26: "... the two general conclusions which the facts so far as known suggest are these: that races of marked physical dissimilarity do not tend to intermarry, and that when and so far as they do, the average offspring is apt to be physically inferior to the average of either parent stock, and probably more beneath the average mental level of the superior than above the average mental level of the inferior." Again, p. 35: "Should this view be correct, it dissuades any attempt to mix races so diverse as are the white European and the negroes." And on p. 36: "The matter ought to be regarded from the side neither of the white nor of the black, but of the future of mankind at large. Now for the future of mankind nothing is more vital than that some races should be maintained at the highest level of efficiency, because the work they can do for thought and art and letters, for scientific discovery, and for raising the standard of conduct, will determine the general progress of humanity. If therefore we were to suppose the blood of the races which are now most advanced to be diluted, so to speak, by that of the most backward, not only would more be lost to the former than would be gained to the latter, but there would be a loss, possibly an irreparable loss, to the world at large." Lastly, p. 39: "The moral to be drawn from the case of the Southern States seems to be that you must not, however excellent your intentions and however admirable your sentiments, legislate in the teeth of facts.... Nevertheless, the general opinion of dispassionate men has come to deem the action taken in A.D. 1870 a mistake."