Since, therefore, I have absolutely debarred myself from receiving any advantage from the sale of the catalogue, it will be reasonable to impute it rather to necessity than choice, that I shall continue it to two volumes more, which the number of the single tracts which have been discovered, makes indispensably requisite.  I need not tell those who are acquainted with affairs of this kind, how much pamphlets swell a catalogue, since the title of the least book may be as long as that of the greatest.

Pamphlets have been for many years, in this nation, the canals of controversy, politicks, and sacred history, and, therefore, will, doubtless, furnish occasion to a very great number of curious remarks.  And I take this opportunity of proposing to those who are particularly delighted with this kind of study, that, if they will encourage me, by a reasonable subscription, to employ men qualified to make the observations, for which this part of the catalogue will furnish occasion, I will procure the whole fifth and sixth volumes[1] to be executed in the same manner with the most laboured part of this, and interspersed with notes of the same kind.

If any excuse were necessary for the addition of these volumes, I have already urged in my defence the strongest plea, no less than absolute necessity, it being impossible to comprise in four volumes, however large, or however closely printed, the titles which yet remain to be mentioned.

But, I suppose, none will blame the multiplication of volumes, to whatever number they may be continued, which every one may use without buying them, and which are, therefore, published at no expense but my own.

There is one accusation still remaining, by which I am more sensibly affected, and which I am, therefore, desirous to obviate, before it has too long prevailed.  I hear that I am accused of rating my books at too high a price, at a price which no other person would demand.  To answer this accusation, it is necessary to inquire what those who urge it, mean by a high price.  The price of things, valuable for their rarity, is entirely arbitrary, and depends upon the variable taste of mankind, and the casual fluctuation of the fashion, and can never be ascertained, like that of things only estimable according to their use.

If, therefore, I have set a high value upon books:  if I have vainly imagined literature to be more fashionable than it really is, or idly hoped to revive a taste well nigh extinguished, I know not why I should be persecuted with clamour and invective, since I only shall suffer by my mistake, and be obliged to keep those books, which I was in hopes of selling.

If those who charge me with asking a high price, will explain their meaning, it may be possible to give them an answer less general.  If they measure the price at which the books are now offered, by that at which they were bought by the late possessor, they will find it diminished at least three parts in four; if they would compare it with the demands of other booksellers, they must first find the same books in their hands, and they will be, perhaps, at last reduced to confess, that they mean, by a high price, only a price higher than they are inclined to give.