bought to-day Schreber’s edition of the “Genera Plantarum,” two francs, two vols. in one, bound, for myself (you have it, I believe), and a second copy of “Linnæi Species Plantarum,” ed. 3 (which is the 2d Holm., as you know, reprinted paginatim at Vienna). I gave five francs, and shall put it down for Sullivant, who should have it, unless indeed you desire to keep it yourself. I have bought (ten francs) the first four vols. of “Mémoires de l’Institut,” 4to, bound, for library of Michigan. Ventenat’s mémoire of Tilia is contained in one, also other botanical papers, and some good old chemical ones, etc. Webb is to put up for me a small parcel of Labilliardière’s New Holland plants. I have bought L’Héritier’s “Cornus,” so now I have the whole complete, and must get it all bound. P. S.--I have just discovered that the copy of L’Héritier’s is imperfect. I feel confident that Webb knows it not, and I of course cannot tell him. I shall have all bound up in one thick volume. Monday evening, April 8.--I finished early this morning, at Richard’s, the examination of those species upon which Michaux’s herbarium is not satisfactory. Richard boasts of his set as the authentic one (which is true), but it is not as complete nor as good as the other, which is partly owing to Richard having divided with Kunth when he could. Michaux must have made a capital collection, since it has moreover supplied the general herbarium with a pretty extensive set, and Desfontaines and Jussieu with many; others I meet in the Ventenat herbarium (Delessert). They say De Candolle has some of Michaux’s plants, and who besides I know not....