Note 1 — INTRODUCTION

To what extent the Jews of the present day or those of earlier times may be considered racially pure, depends upon what criteria of race are adopted. At present there is no general agreement among ethnologists on this subject. The historical data are very uncertain. At all events absolute racial unity of the Jews of the Dispersion cannot be maintained. The facts of their vigorous propaganda and their extensive slave-property are too well attested. But it is wholly impossible to determine how far the admixture went.