This favorable situation of the Jews had a stimulating effect on the degenerate Karaites, who migrated in considerable numbers from Asia, the Crimea and southern Poland, to take up their abode with their more happily placed brethren in Constantinople and Adrianople. The Karaites, whose fundamental principle is the study and reasonable interpretation of the Bible, were in so lamentable a state of ignorance, that their entire religious structure had become a system of authorized dogmas and traditions more rigid even than that of the Rabbanites. The extent of their intellectual decline may be measured by the fact that in the course of a century they failed to produce a single moderately original theological writer. Those with a bent for study were compelled to sit at the feet of Rabbanite teachers and receive from them instruction in the Scriptures and the Talmud. The proud masters of Bible exegesis had become the humble disciples of the once despised Rabbanites. The petrifaction of Karaism is illustrated by an event in European Turkey. A Karaite college, consisting of Menachem Bashyasi, his son Moses Bashyasi, Menachem Maroli, Michael the Old, his son Joseph, and a few others, had permitted the lights necessary for the Sabbath eve to be prepared on Friday, so that the holy day need not be spent in darkness. The college gave adequate reasons for the innovation. According to a Karaite principle, not only an ecclesiastical authority, but any individual is justified in abolishing an ancient custom, or annulling former decisions, if he can cite sufficient exegetical authority. Nevertheless, stormy opposition arose (about 1460) against this decision, aimed at a custom derived, perhaps, from Anan, the founder of Karaism, and hence possessing the sacredness conferred by the rust of seven centuries. Schism and friction were the result. The section of the community which ventured to prepare the lights required for the Sabbath eve was abused, and charged with heresy. Moreover, the schism relating to the commencement of the festivals was still unhealed. The Palestinian Karaite communities and their neighbors continued to distinguish between an ordinary and a leap year by the state of the barley harvest, and to regulate their festivals by the appearance of the new moon. On the other hand, the communities in Turkey, the Crimea, and southern Poland, used the calendar of the Rabbanites. These hereditary differences were eating more and more into the solidarity of the sect, for there was no means of composing them, and agreeing upon uniform principles.