the Church father wrote on dogmatic, the Rabbi on legal, questions. Between the middle of the fourth century and the time of the Geonim, we find no information as to the use of letters among the Jews. From that period onwards, however, Jews became very diligent letter-writers, and sometimes, for instance in the case of the "Guide of the Perplexed" of Maimonides, whole works were transmitted in the form of letters. The scattering of Israel, too, rendered it important to Jews to obtain information of the fortunes of their brethren in different parts of the world. Rumors of Messianic appearances from the twelfth century onwards, the contest with regard to the study of philosophy, the fame of individual Rabbis, the rise of a class of travellers who made very long and dangerous journeys, all tended to increase the facilities and necessities of intercourse by letter. It was long, however, before correspondence became easy or safe. Not everyone is possessed of the postmen assigned in Midrashim to King Solomon, who pressed demons into his service, and forced them to carry his letters wheresoever he willed. Chasdai experienced considerable difficulty in transmitting his famous letter to the king of the Chazars, and that despite his position of authority in the Spanish State. In 960 a letter on some question of Kasher was sent from the Rhine to Palestine--proof of the way in which the most remote Jewish communities corresponded. The question of the materials used in writing has an important bearing on our subject. Of course, the ritual regulations for writing the holy books, the special preparation of the parchment, the ink, the strict rules for the formation of the letters, hardly fall within the province of this article. In ancient times the most diverse substances were used for writing on. Palm-leaves (for which Palestine of old was famous) were a common object for the purpose, being so used all over Asia. Some authorities believe that in the time of Moses the palm leaf was the ordinary writing-material. Olive-leaves, again, were thick and hard, while carob-leaves (St. John's bread), besides being smooth, long, and broad, were evergreen, and thus eminently fitted for writing. Walnut shells, pomegranate skins, leaves of gourds, onion-leaves, lettuce-heads, even the horns of cattle, and the human body, letters being tattooed on the hands of slaves, were all turned to account. It is maintained by some that leather was the original writing-material of the Hebrews; others, again, give their vote in favor of linen, though the Talmud does not mention the latter material in connection with writing. Some time after Alexander the Great, the Egyptian papyrus became common in Palestine, where it probably was known earlier, as Jewish letters on papyrus were sent to Jerusalem from the Fayyum in the fifth century B.C.E. Even as late as Maimonides, the scrolls of the Law were written on leather, and not on parchment, which is now the ordinary