So far, then, from history and anthropology giving contrary verdicts with regard to the racial purity of the Jews, the above considerations would seem to show that they rather confirm one another's interpretation of the facts. If brain capacity and skull index follow the intellectual struggle for existence, we should not be surprised to find the Jews mostly broad-headed. If there had been much intermixture with races who had less cause to exercise their brains in the struggle for existence, we might expect a greater admixture of dolichocephalism among them. To my mind a much stronger case could have been made out for the admixture of the Jews by the large number of blondes among them, ranging to about twenty per cent, but, as a rule, in Europe blond types are dolichocephalic, and the evidence of admixture that could be drawn from the admixture of blue eyes or brown hair among the Jews is counterbalanced by that very evidence of their uniform round-headedness, upon which Professor Ripley lays so much stress. In the memoir I have frequently quoted I have given reasons for believing that there was a blond as well as a brunette type among the ancient Jews, and till evidence is shown to the contrary the presence of the fair Jew is only an indication of descent from the earlier blond strain of the race. Professor Ripley has scarcely taken into account the more positive arguments I have adduced in my memoir for the comparative purity of Jewish descent. I have pointed out a definite class of Jews--the Cohens, or priestly descendants of Aaron--who can not, according to Jewish law, marry proselytes. These still constitute, I have calculated, some five per cent of Jews even at the present day. He appears to think that this is merely a matter of name, and asks how I would explain the existence of quasi-Jewish names, such as Davis, Harris, Phillips, and Hart, among Christian populations of the Anglo-Saxon world. As a matter of fact, it can be proved that, on the contrary, these names among the Jews have been adopted for "mimicry" reasons from the corresponding Christian names which are mostly derived from the Bible. But, at the best, Professor Ripley's argument would merely prove a certain amount of Jewish blood among the Christian populations of Europe and America, which nobody would deny. That Jews, under the pressure of persecution or for other reasons, have abjured their faith, married Christian wives, and become merged in the surrounding populations, is undoubtedly a fact, but does not in any way affect the relative purity of the "remnant" which has remained true to its faith. It certainly does not affect the very important fact that the ancestry of at least five per cent of Jews at the present day can not have married proselytes, owing to the rigid requirements of Jewish law.