Page:Essays in librarianship and bibliography.djvu/99

At last, however, the copy goes to press, the proof is promptly returned and corrected (we are content with a single revise), and the three or four bulky volumes of manuscript are condensed into a single handy and portable volume of type, printed in double columns and on ordinary paper for subscribers, but for reading-room use in single column on a strong vellum paper, adapted to bear rough handling, the opposite column being left blank for insertions, and the book supplied with guards to allow of interleaving. There have hitherto been on the average 220 columns or 110 folios to a volume. On the average of twenty entries to a column, which is rather under the mark, this gives 4400 titles to each volume. The blank space left for insertions and the provision for interleaving would allow of this number of titles being quadrupled, but the weight of the paper prescribes a limit which it would be inconvenient to transgress. Supposing that each volume will take 9000 titles only, then, as the Reading Room will accommodate 2000 volumes of catalogue without encroachment on the reference library, sufficient space will have been provided for eighteen millions of titles, or for three centuries' accumulations at the present annual rate of increase. A year or two ago we were at an utter loss how to accommodate less than three million titles. Several volumes are now (September 1882) in hand in various stages of progress. The number fully completed and placed in the Reading Room is twenty-two, which comprise the contents of about 70 manuscript volumes, including, with