Society as conceived in these modern days is based upon men's relations to their families, their disciples, and their friends. They are the three elements that determine a man's usefulness as a social factor. Our first interest, then, is to know Mendelssohn in his family.[78] Many years were destined to elapse, after his coming to Berlin, before he was to win a position of dignity. When, a single ducat in his pocket, he first reached Berlin, the reader remembers, he was a pale-faced, fragile boy. A contemporary of his relates: "In 1746 I came to Berlin, a penniless little chap of fourteen, and in the Jewish school I met Moses Mendelssohn. He grew fond of me, taught me reading and writing, and often shared his scanty meals with me. I tried to show my gratitude by doing him any small service in my power. Once he told me to fetch him a German book from some place or other. Returning with the book in hand, I was met by one of the trustees of the Jewish poor fund. He accosted me, not very gently, with, 'What have you there? I venture to say a German book!' Snatching it from me, and dragging me to the magistrate's, he gave orders to expel me from the city. Mendelssohn, learning my fate, did everything possible to bring about my return; but his efforts were of no avail." It is interesting to know that it was the grandfather of Herr von Bleichröder who had to submit to so relentless a fate. German language and German writing Mendelssohn acquired by his unaided efforts. With the desultory assistance of a Dr. Kisch, a Jewish physician, he learnt Latin from a book picked up at a second-hand book stall. General culture was at that time an unknown quantity in the possibilities of Berlin Jewish life. The schoolmasters, who were not permitted to stay in the city more than three years, were for the most part Poles. One Pole, Israel Moses, a fine thinker and mathematician, banished from his native town, Samosz, on account of his devotion to secular studies, lived with Aaron Gumpertz, the only one of the famous family of court-Jews who had elected a better lot. From the latter, Mendelssohn imbibed a taste for the sciences, and to him he owed some direction in his studies; while in mathematics he was instructed by Israel Samosz, at the time when the latter, busily engaged with his great commentary on Yehuda Halevi's _Al-Chazari_, was living at the house of the Itzig family, on the _Burgstrasse_, on the very spot where the talented architect Hitzig, the grandson of Mendelssohn's contemporary, built the magnificent Exchange. To enable himself to buy books, Mendelssohn had to deny himself food. As soon as he had hoarded a few _groschen_, he stealthily slunk to a dealer in second-hand books. In this way he managed to possess himself of a Latin grammar and a wretched lexicon. Difficulties did not exist for him; they vanished before his industry and perseverance. In a short time he knew far more than