Compare for a moment with the results stated of the Astor Library's early purchases, the average prices paid by British Libraries for books purchased from 1826 to 1854, as published in a parliamentary return. The average cost per volume varied from 16s or about $4 a volume, for the University Library of Edinburgh, to 4s 6d, or $1.10 a volume for the Manchester Free Library. The latter, however, were chiefly popular new books, published at low prices, while the former included many costly old works, law books, etc. The British Museum Library's average was 8s 5d or about $2.00 per volume. Those figures represent cloth binding, while the Astor's purchases were mostly in permanent leather bindings.

Averages are very uncertain standards of comparison, as a single book rarity often costs more than a hundred volumes of the new books of the day; but in a library filled with the best editions of classical and scientific works, and reference books, I presume that two dollars a volume is not too high an estimate of average cost, in these days represented by the last twenty years. For a circulating library, on the other hand, composed chiefly of what the public most seek to read, half that average would perhaps express the full commercial value of the collection. Of its intrinsic value I will not here pause to speak.

There are many methods of book buying, of which we may indicate the principal as follows:

Each of these methods has its advantages—and, I may add, its disadvantages likewise. The collector who combines them, as opportunity presents, is most likely to make his funds go the farthest, and to enrich his collection the most. Direct orders for purchase are necessary for most new books wanted, except in the case of the one government library, which in most countries, receives them under copyright provision. An advantageous arrangement can usually be made with one or more book-dealers, to supply all new books at a fairly liberal discount from retail prices. And it is wise management to distribute purchases where good terms are made, as thereby the trade will feel an interest in the library, and a mutuality of interest will secure more opportunities and better bargains.

The submission of lists of books wanted, to houses having large stocks or good facilities, helps to make funds go as far as possible through competition. By the typewriter such lists can now be manifolded much more cheaply than they can be written or printed.

Selection from priced catalogues presents a constantly recurring opportunity of buying volumes of the greatest consequence, to fill gaps in any collection, and often at surprisingly low prices. Much as book values have been enhanced of late years, there are yet catalogues issued by American, English and continental dealers which quote books both of the standard and secondary class at very cheap rates. Even now English books are sold by the Mudie and the W. H. Smith lending libraries in London, after a very few months, at one-half to one-fourth their original publishing price. These must usually be rebound, but by instructing your agent to select copies which are clean within, all the soil of the edges will disappear with the light trimming of the binder.

Purchase at auction supplies a means of recruiting libraries both public and private with many rare works, and with the best editions of the standard authors, often finely bound. The choice private libraries of the country, as well as the poor ones, tend to pour themselves sooner or later into public auctions. The collectors of books, whose early avidity to amass libraries of fine editions was phenomenal, rarely persist in cultivating the passion through life. Sometimes they are overtaken by misfortune—sometimes by indifference—the bibliomania not being a perennial inspiration, but often an acute and fiery attack, which in a few years burns out. Even if the library gathered with so much money and pains descends to the heirs of the collector, the passion for books is very seldom an inherited one. Thus the public libraries are constantly recruited by the opportunities of selection furnished by the forced sale of the private ones. Here, public competition frequently runs up the price of certain books to an exorbitant degree, while those not wanted often sell for the merest trifle. One should have a pretty clear idea of the approximate commercial value of books, before competing for them at public sale. He may, however, if well persuaded in his own mind as to the importance or the relative unimportance to his own collection of any work, regulate his bids by that standard, regardless of commercial value, except as a limit beyond which he will not go. Few librarians can personally attend auction sales—nor is it needful, when limits can so easily be set to orders. It is never safe to send an unlimited bid, as there may be others without limit, in which case the book is commonly awarded to the most remote bidder.

There are many curiosities of the auction room, one of them being the frequent re-appearance of book rarities which have been through several auctions, sometimes at intervals of years, keenly competed for by rival bibliophiles, and carried off in triumph by some ardent collector, who little thought at the time how soon his own collection would come to the hammer.

There are also many curiosities of compilation in auction catalogues. Not to name errors of commission, like giving the authorship of books to the wrong name, and errors of omission, like giving no author's name at all, some catalogues are thickly strewn with the epithets rare—and very rare, when the books are sufficiently common in one or the other market. Do not be misled by these surface indications. Books are often attributed in catalogues to their editor or translator, and the unwary buyer may thus find himself saddled with a duplicate already in his own collection. There has been much improvement in late years in the care with which auction catalogues are edited, and no important collection at least is offered, without having first passed through the hands of an expert, familiar with bibliography. It is the minor book sales where the catalogues receive no careful editing, and where the dates and editions are frequently omitted, that it is necessary to guard against. It is well to refrain from sending any bids out of such lists, because they furnish no certain identification of the books, and if all would do the same, thus diminishing the competition and the profit of the auctioneer, he might learn never to print a catalogue without date, place of publication, and full name of author of every book offered.