In a treatise devoted to an inquiry concerning the varying prices of books, it is necessary that at least one chapter should be devoted to manuscripts. There is no field of investigation which offers a more interesting subject for study, and few that are more difficult to master. Manuscripts are really more attractive than printed books, because they are so various, and have been produced over a much longer period of the world’s history. It is therefore strange that so few authors care to trouble themselves about them; that this is so may be seen from the large number of readers at the British Museum who are contented to quote over and over again from the much-used printed books, and the comparatively few who cultivate the virgin soil of the Manuscript Department, where there are endless stores of unused materials. Manuscripts are usually somewhat miscellaneous in character, for they consist (1) of some of the finest examples of the pictorial art of many ages; (2) of the originals of the great works of antiquity; (3) of a large number of valuable works that have never been printed; (4) of charters, documents, letters, memoranda, &c., which are of great value, but which are not books, and therefore do not come within the scope of our present inquiry. In respect to the prices of the manuscripts, it is very difficult to say anything of much value, because (1) many of the most important manuscripts have been transferred from library to library in bulk, and it is comparatively seldom that they come up for public sale; (2) the buyers of manuscripts are fewer than those of printed books, and therefore it is more difficult to arrive at a real standard price for books which are practically unique, as there is no wide public opinion upon the subject. But for the present purpose, a still more important reason why this vast subject cannot be dealt with in a succinct manner is, that the materials for its history have not yet been thoroughly investigated by experts. The relative prices at different periods are hard to understand, even in England, where money has been better regulated than in most countries; but when we have to deal with foreign countries and foreign coins, we are necessarily at a loss how to convert into their present value coins which may have been depreciated at the time we are dealing with, and have certainly been still more depreciated since: for instance, what idea is communicated to the mind of the modern reader when he is told that “Borso d’Este paid forty ducats for a _Josephus_ and a _Quintus Curtius_, while his large two-volume Bible cost him 1375 sequins”?[13]