(1) The small number of the books originally printed leads to rarity. This is by no means peculiar to early impressions of the press: on the contrary, of some books printed only last year not one tenth as many exists as of a multitude of books printed four centuries ago. Not only privately printed books, not designed for publication, but some family or personal memoirs, or original works circulated only among friends, and many other publications belong to this class of rarities. The books printed at private presses are mostly rare. Horace Walpole's Strawberry Hill press produced some thirty works from 1757 to 1789, in editions varying from fifty to six hundred copies. The Lee Priory press of Sir E. Brydges printed many literary curiosities, none of which had more than one hundred impressions. Most of the editions of the Shakespearean and other critical essays of J. O. Halliwell Phillipps were limited to forty copies, or even less. The genealogical and heraldic imprints of Sir Thomas Phillipps, at the Middle Hill press, 1819-59, numbering some hundreds of different works, were mostly confined to twenty copies each, and some to only six copies. Some of them are as rare as many manuscripts, of which several copies have been made, and sell at prices dictated by their scarcity. Most of them are in the Library of Congress. The Kelmscott press of William Morris printed in sumptuous style, improved upon the finest models of antique typography, a number of literary works, which now bring enhanced prices. Of the many historical and literary publications of the Roxburghe Club, the Percy Society, the Maitland, the Abbotsford, and the Bannatyne Clubs abroad, only thirty to one hundred copies were printed. Of those of the Prince Society, the Grolier Club, and others in America, only from 150 to 300 copies were printed, being for subscribers only. Rarity and enhanced prices necessarily result in all these cases. Of some books, only five to ten copies have been printed, or else, out of fifty or more printed, all but a very few have been ruthlessly destroyed, in order to give a fanciful value to the remainder. In these extreme instances, the rarity commonly constitutes almost the sole value of the work.
(2) Even where many copies have been printed, the destruction of the greater part of the edition has rendered the book very rare. Printing offices and book binderies are peculiarly subject to fires, and many editions have thus been consumed before more than a few copies have been issued. The great theological libraries edited by the Abbe J. P. Migne, the Patrologie Grecque, et Latine, owe their scarcity and advanced prices to a fire which consumed the entire remainder of the edition. All the copies of a large edition of "Twenty years among our savage Indians," by J. L. Humfreville, were destroyed by fire in a Hartford printing office in 1899, except two, which had been deposited in the Library of Congress, to secure the copyright. The whole edition of the Machina coelestis of Hevelius was burned, except the few copies which the author had presented to friends before the fire occurred. The earlier issues in Spanish of the Mexican and Peruvian presses prior to 1600 are exceedingly rare. And editions of book.3 printed at places in the United States where no books are now published are sought for their imprint alone and seldom found.
(3) Many books have become rare because proscribed and in part destroyed by governmental or ecclesiastical authority. This applies more especially to the ages that succeeded the application of printing to the art of multiplying books. The freedom of many writers upon politics and popular rights led to the suppression of their books by kings, emperors or parliaments. At the same time, books of church history or doctrinal theology which departed, in however slight a degree, from the standard of faith proclaimed by the church, were put in the Index Expurgatorius, or list of works condemned in whole or in part as heretical and unlawful to be read. A long and melancholy record of such proscriptions, civil and ecclesiastical, is found in Gabriel Peignot's two volumes-Dictionnaire des livres condamnes au feu, supprimes, ou censures, etc. Works of writers of genius and versatile ability were thus proscribed, until it gave rise to the sarcasm among the scholars of Europe, that if one wanted to find what were the books best worth reading, he should look in the Index Expurgatorius. It appears to have been quite forgotten by those in authority that persecution commonly helps the cause persecuted, and that the best way to promote the circulation of a book is to undertake to suppress it. This age finds itself endowed with so many heretics that it is no longer possible to find purchasers at high prices for books once deemed unholy. Suppressed passages in later editions lead to a demand for the uncastrated copies which adds an element of enhanced cost in the market.

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