The libraries of such institutions were placed by the abbot under the sole charge of the "armarian," an officer who was made responsible for the preservation of the volumes under his care; be was expected frequently to examine them, lest damp or insects should injure them; he was to cover them with wooden covers to preserve them and carefully to mend and restore any damage which time or accident might cause; he was to make a note of any book borrowed from the library, with the name of the borrower; but this last rule applied only to the less valuable portion of it, as the "great and precious books" could only be lent by the permission of the abbot himself. It was also the duty of the armarian to have all the books in his charge marked with their correct titles, and to keep a perfect list of the whole. Some of these catalogues are still in existence and are curious and interesting in their exemplification of the kinds of ink employed and as indicative of the state of literature in the Middle Ages, besides presenting the names of many authors whose works have never reached us. It was also the duty of the armarian, under the orders of his superior, to provide the transcribers of manuscripts with the writings which they were to copy, as well as all the materials necessary for their labors, to make bargains as to payment, and to superintend the work during their progress. These transcribers, Mr. Maitland in his "Dark Ages" tells us, were monks and their clerks, some of whom were so skilled that they could perform all the different branches. They were exhorted by the rules of their order to learn writing, and to persevere in the work of copying manuscripts as being one most acceptable to God; those who could not write were recommended to bind books. This was in line with the behest of the famous monk Alciun who lived in the eighth century and who entreated all to employ themselves in copying books, saying: "It is a most meritorious work, more useful to the health than working in the fields, which profits only a man's body, while the labour of a copyist profits his soul." When black ink was used in liturgical writings, the title page and heads of chapters were written in red ink; whence comes the term rubric. Green, purple, blue and yellow inks were sometimes used for words, but chiefly for ornamenting capital letters. A large room was in most monasteries set apart for such labors and here the general transcribers pursued their avocations; in addition, small rooms or cells, known also as scriptoria, occupied by such monks as were considered, from their piety and learning, to be entitled to the indulgence, and used by them for their private devotions, as well as for the purpose of transcribing works for the use of the church or library. The scriptoria were frequently enriched by donations and bequests from those who knew the value of the works carried on in them, and large estates were often devoted to their support.