One cannot enter a book shop or a library to-day without realizing how many thousands of books are in constant circulation. There was an age when books were laboriously but most beautifully written, instead of being thus quickly manufactured by the aid of the type-setting machine; the material on which the glossy text was executed was vellum instead of the cheap paper of to-day, the illustrations, instead of being easily reproduced by photographic processes, were veritable miniature paintings, most decorative, ablaze with colour and fine gold,--in these times it is easy to forget that there was ever a period when the making of a single book occupied years, and sometimes the life-time of one or two men. In those days, when the transcription of books was one of the chief occupations in religious houses, the recluse monk, in the quiet of the scriptorium, was, in spite of his seclusion, and indeed, by reason of it, the chief link between the world of letters and the world of men. The earliest known example of work by a European monk dates from the year 517; but shortly after this there was a great increase in book making, and monasteries were founded especially for the purpose of perpetuating literature. The first establishment of this sort was the monastery of Vivaria, in Southern Italy, founded by Cassiodorus, a Greek who lived between the years 479 and 575, and who had been the scribe (or "private secretary") of Theodoric the Goth. About the same time, St. Columba in Ireland founded a house with the intention of multiplying books, so that in the sixth century, in both the extreme North and in the South, the religious orders had commenced the great work of preserving for future ages the literature of the past and of their own times. Before examining the books themselves, it will be interesting to observe the conditions under which the work was accomplished. Sometimes the scriptorium was a large hall or studio, with various desks about; sometimes the North walk of the cloister was divided into little cells, called "carrels," in each of which was room for the writer, his desk, and a little shelf for his inks and colours. These carrels may be seen in unusual perfection in Gloucester. In very cold weather a small brazier of charcoal was also introduced.