Delessert received me very kindly when I called on him. I must call again soon, and consult especially his rich library. He showed me a list he had just ordered from New York; among which of course was our “Flora.” I should have offered him a copy, but now it is scarcely worth while.... I shall not see De Candolle here. Delessert does not expect him until May. I shall leave the books and parcels for him with Delessert, and make De Candolle take back to Geneva with him all my parcels that I do not wish to take with me to the south. April 2, evening, or rather April 3, as it is past midnight.--I have worked to-day as hard as I could jump from ten to half past five o’clock at the herbarium général of the Museum de Paris, and have finished. Apart from Michaux’s plants, of which they have nearly a set distributed, they are wretchedly poor in North American species; almost none of Lamarck and Poiret. I except the plants given by LeConte, Torrey, etc., which are arranged but not incorporated. The present Gallery of Botany is exceedingly fine and spacious, and well planned. I have gone carefully through all Michaux’s herbarium (from your limited time you have made some bad slips in the Carices of Michaux, which Gay, I am sorry to say, has found out), noting all dubious matters to be settled by examination of Richard’s set. I have gone through De la Pylaie’s herbarium completely and carefully; I have examined the herbarium given by Humboldt,--not complete but said to be as large as Kunth’s own set or more so, and labeled by Kunth; I have looked at everything here which I thought could interest us, but some I found not, such as Cercocarpus; I have examined some other separate sets of the same kind. I am now ready to glance through Jussieu’s herbarium, which is said to contain many Lamarck and Poiret; to spend a little time in Richard’s, a few hours more for Desfontaines at Webb’s, and perhaps Berlandier’s[86] plants, though these are distributed through Webb’s immense collection; this I can do, however, in evenings. Then a morning or two at Delessert’s, which will be more occupied with examination of books than plants, will, I believe, finish. Webb has promised to give me some plants of Labilliardière, whose herbarium he bought, as he did Mercier’s, in which he got many of Nuttall’s plants. He has also a collection of Lady Dalhousie’s from North America, all Drummond’s, etc., etc.; so he is pretty rich in North American plants, but they are not all arranged yet. Webb has most generously presented me with a complete copy of L’Héritier’s Works (in sheets) except the “Cornus,” which I have this day bought of the Jew Meilhac, and for which I was obliged to give six francs. I shall have the whole bound in two large folio volumes: “Cornus” and “Sertum Anglicum” in one, “Stirpes Novæ” and “Geraniologia” in the other. I think thus far that the few copies of the “Flora” I have given away have turned to good account. I meant to go to Jussieu