A Manual for Mediaeval Librarians...

* Books by men and women must never be shelved side by side.
* Books about children, or written for them, must be accompanied on the shelves by books about adult authors.
* Books about youth must be returned by borrowers and back on their shelves by nightfall each day.
* Books by aged writers must be carefully supported.
* Books written for the poorly-sighted and elderly should be shelved near windows or candlestands, unless they be illuminated.
* Books on the Index Librorum Prohibitorum must be susted regularly, and may be loaned only to the illiterate.
* Books on diseases and infection must be kept in strict isolation from the main collection.
* Books on scientific, vulgar, and worldly subjects must come under persistent fumigation.
* Books about murder, thievery, and other evils of human behavior are best set near volumes on ecclesiastical and civil law, from which they might find benefit.
* Folios are best preserved if placed flat, that they may rest at ease; and at some distance from their smaller brethren, so that each may retain its dignity of size, neither aggrandized nor belittled.

(Courtesy of "Fra" William F.E. Morley, former Curator of Special Collections, Douglas Library, Queen's University at Kingston, as published in a limited edition by Wolfe Editions on behalf of the Baxter Soceity.)