Denis Guyon, Chev. Seigneur de Sardiere, Ancien Capitaine au Regiment du Roi, et l'un des Seigneurs du Canal de Briare._ Paris, 1759, 8vo. It is justly said, in the "advertisement" prefixed to this catalogue, that, in running over the different classes of which the collection is composed, there will be found articles "capable de piquer la curiosite des bibliophiles." In ancient and modern poetry, and in romances--especially relating to chivalry--this "ancient Captain" appears to have been deeply versed. The advertisement is followed by 28 pages of "Eclaircissemens"--which give an interesting account of some precious manuscripts of old poetry and romances. A MS. note, in my copy of this catalogue, informs me that the books were sold "en masse."----HEINSIUS. (NIC.) _Nicolai Heinsii Bibliothecae Catalogus_, (1682) 8vo. A portrait of the elegant and learned owner of this collection faces the title-page. The books contained in it are remarkable both for their rarity and intrinsic value; and a great number of them were enriched with the notes of Scaliger, Salmasius, and others. Few collections display more judgment and taste in the selection than the present one; and few critics have been of more essential service to the cause of ancient classical literature than Nicholas Heinsius. He excelled particularly in his editions of the poets. Mr. Dyer, of Exeter, the bookseller, has a copy of this catalogue, which was formerly Graevius's; in which that celebrated critic has made marginal remarks concerning the rarity and value of certain works described in it.----HOHENDORF. _Bibliotheca Hohendorfiana; ou Catalogue de la Bibliotheque de feu Mons. George Guillaume Baron de Hohendorf: a la Haye_, 1720, 8vo., three parts. A magnificent collection; which a MS. note, by Dr. Farmer (in my copy of the catalogue), informs me was "added to the Emperor's library at Vienna." In the _Bibl. Mencken_, p. 10, it is thus loftily described: "Catalogus per-rarus rarissimis libris superbiens."----HOYM. _Catalogus Librorum Bibliothecae Caroli Henrici Comitis de Hoym_, 1738, 8vo. This catalogue, which is exceedingly well "digested by Martin," is a great favourite with collectors. A copy out of Count Hoym's collection tells well--whether at a book-sale, or in a bookseller's catalogue. There are copies upon LARGE PAPER, which, when priced, sell high.----HULSIUS. _Bibliotheca Hulsiana, sive Catalogus Librorum quos magno labore, summa cura et maximis sumptibus collegit Vir Consularis Samuel Hulsius._ Hag. Com. 1730, four vols. 8vo. (the second and third being in two parts, and the fourth in three). This is, in sober truth, a wonderful collection of books; containing nearly 34,000 articles--which, allowing three volumes to an