In its wide sense Haskalah denotes enlightenment. Those who strove to enlighten their benighted coreligionists or disseminate European culture among them, were called Maskilim. A careful perusal of this work will reveal the exact ideals these terms embody. For Haskalah was not only progressive, it was also aggressive, militant, sometimes destructive. From the days of Mordecai Guenzburg to the time of Asher Ginzberg (Ahad Ha-'Am), it changed its tendencies and motives more than once. Levinsohn, "the father of the Maskilim," was satisfied with removing the ban from secular learning; Gordon wished to see his brethren "Jews at home and men abroad"; Smolenskin dreamed of the rehabilitation of Jews in Palestine; and Ahad Ha-'Am hopes for the spiritual regeneration of his beloved people. Others advocated the levelling of all distinctions between Jews and Gentiles, or the upliftment of mankind in general and Russia in particular. To each of them Haskalah implied different ideals, and through each it promulgated diverse doctrines. To trace these varying phases from an indistinct glimmering in the eighteenth century to the glorious effulgence of the beginning of the twentieth, is the main object of this book. In pursuance of my end, I have paid particular attention to the causes that retarded or accelerated Russo-Jewish cultural advance. As these causes originate in the social, economic, and political status of the Russian Jew, I frequently portray political events as well as the state of knowledge, belief, art, and morals of the periods under consideration. For this reason also I have marked the boundaries of the Haskalah epochs in correspondence to the dates of the reigns of the several czars, though the correspondence is not always exact. Essays have been published, on some of the topics treated in these pages, by writers in different languages: in Russian, by Bramson, Klausner, and Morgulis; in Hebrew, by Izgur, Katz, and Klausner; in German, by Maimon, Lilienthal, Wengeroff, and Weissberg; in English, by Lilienthal and Wiener; and in French, by Slouschz. The subject as a whole, however, has not been treated. Should this work stimulate further research, I shall feel amply rewarded. Without prejudice and without partiality, by an honest presentation of facts drawn from what I regard as reliable sources, I have tried to unfold the story of the struggle of five millions of human beings for right living and rational thinking, in the hope of throwing light on the ideals and aspirations and the real character of the largely prejudged and misunderstood Russian Jew. In conclusion, I wish to express my gratitude and indebtedness to those who encouraged me to proceed with my work after some specimens of it had been published in several Jewish periodicals, especially to Doctor Solomon Schechter, Rabbi Max Heller, and Mr. A.S. Freidus, for their courtesy and assistance while the work was being written. JACOB S. RAISIN. E. Las Vegas, N. Mex.,