From the vexatious disappointment of meeting reproach, where praise is expected, every man will certainly desire to be secured; and, therefore, that book will have some claim to his regard, from which he may receive informations of the labours of his predecessors, such as a catalogue of the Harleian library will copiously afford him.

Nor is the use of catalogues of less importance to those whom curiosity has engaged in the study of literary history, and who think the intellectual revolutions of the world more worthy of their attention, than the ravages of tyrants, the desolation of kingdoms, the rout of armies, and the fall of empires.  Those who are pleased with observing the first birth of new opinions, their struggles against opposition, their silent progress under persecution, their general reception, and their gradual decline, or sudden extinction; those that amuse themselves with remarking the different periods of human knowledge, and observe how darkness and light succeed each other; by what accident the most gloomy nights of ignorance have given way to the dawn of science; and how learning has languished and decayed, for want of patronage and regard, or been overborne by the prevalence of fashionable ignorance, or lost amidst the tumults of invasion, and the storms of violence.  All those who desire any knowledge of the literary transactions of past ages, may find in catalogues, like this at least, such an account as is given by annalists, and chronologers of civil history.

How the knowledge of the sacred writings has been diffused, will be observed from the catalogue of the various editions of the Bible, from the first impression by Fust, in 1462, to the present time; in which will be contained the polyglot editions of Spain, France, and England, those of the original Hebrew, the Greek Septuagint, and the Latin Vulgate; with the versions which are now used in the remotest parts of Europe, in the country of the Grisons, in Lithuania, Bohemia, Finland, and Iceland.

With regard to the attempts of the same kind made in our own country, there are few whose expectations will not be exceeded by the number of English Bibles, of which not one is forgotten, whether valuable for the pomp and beauty of the impression, or for the notes with which the text is accompanied, or for any controversy or persecution that it produced, or for the peculiarity of any single passage.  With the same care have the various editions of the book of Common Prayer been selected, from which all the alterations which have been made in it may be easily remarked.

Amongst a great number of Roman missals and breviaries, remarkable for the beauty of their cuts and illuminations, will be found the Mosarabick missal and breviary, that raised such commotions in the kingdom of Spain.

The controversial treatises written in England, about the time of the Reformation, have been diligently collected, with a multitude of remarkable tracts, single sermons, and small treatises; which, however worthy to be preserved, are, perhaps, to be found in no other place.