Until the present time, this flaxen and hempen rag paper has been produced in sufficient quantities for the necessities of our civilization, but as civilization increases, and as education becomes more general, especially among the masses of Europe, it is evident that the supply of rags will be inadequate to the demand, and wood will most probably again be brought into requisition, as in the age of Pericles. Not, however, in the form of the ancient tablets, but transformed by mechanical and chemical science into sheets of white and pliant paper; or the numerous fibrous plants of Algeria, Cuba, and other tropical countries will be turned to account, and no longer permitted to waste their usefulness on the desert air. Even now, in France, among the Vosges Mountains, there is a paper manufactory where wood is manipulated with the most complete success. And some few years since, a newspaper paragraph informed the civilized world that a process of making paper from marble had been discovered by a canny Scotchman of Glasgow! It is not, indeed, impossible that the marble painfully hewn and engraven by our forefathers to perpetuate the memory of a bloody struggle or of some vain triumph, may in time to come, by the magic power of modern science, become a sheet of snowy tissue, whereon the fair, slight hand of beauty shall trace the dainty nothings of fashionable life! The tablets so continually mentioned by ancient writers must be noted. They were made of parchment, thin boards, ivory, or metal, prepared to receive ink, or coated with wax and written on with a stylus, or sharp-pointed pencil. In the Fourth Book of Kings we read: "I will efface Jerusalem as tables are wont to be effaced, and I will erase and turn it, and draw the pencil over the face thereof." Herodotus and Demosthenes speak of their tablets. In Rome, they were used not only as note-books and journals, but also for correspondence in the city and its environs, while the papyrus served for letters intended to be sent to a distance. The receiver of one of these notes not unfrequently returned his answer on the same tablet. Made of African cypress and highly ornamented and inlaid, they were given as presents, precisely as portfolios, souvenirs, and note-books are nowadays. On the wax-covered tablets was generally traced the first rough copy of any document, to be afterward neatly written out either on papyrus or parchment. These wax-covered tablets were used in France until the beginning of the last century. Two-leaved tablets were called diptychs, and were sometimes of extraordinary cost and beauty. The Roman consuls and high magistrates were accustomed, on their first appointment to office, to present their friends with ivory diptychs, exquisitely engraved and carved, and ornamented with gold.