This volume is an attempt to present the results of anthropo logical, demographic, pathological, and sociological investiga tions of the Jews. Considering that one-fifth of all the Jews in the world live at present in English-speaking countries, and that the migrations of Eastern European Jews tend toivard the United States and England with its colonies, I believe I need not apologize for claiming attention to this subject. The facts presented are not available in any book, and it may safely be declared that the whole world is interested in the subject of the Jews as a race, and the getting into closer touch with the ethnic relations of the Jews. Moreover, the perennial problem, whether it is possible to assimilate the vast number of Southern and Eastern immigrants to the United States and British colonies has been applied more to the Jews than to any other white people. It has even been questioned whether there is ever a probability of incorporating the Jews into the body politic of anglo-saxon communities.