Yours truly and affectionately, A. GRAY. TO W. J. HOOKER. NEW YORK, April 4, 1835. DEAR SIR,--Your kind letter of December 11, with the parcel of books you were so good as to send me, were in due time received, for both of which I beg you to accept my thanks. Perhaps you will do me the favor to accept a copy of the second part of the “North American Gramineæ and Cyperaceæ,” being a continuation of my attempt to illustrate our species of these families, the plan of which, I am gratified to learn, meets your approbation. I inclose in the same parcel the loose sheets of an unpublished portion of the third volume of the “Annals of the New York Lyceum of Natural History,” comprising an attempt at a monography of the genus Rhynchospora. A more perfect copy, with a copy of the engraving, now in the hands of the artist, will be transmitted to you by the earliest opportunity. I also send a little parcel of mosses, nearly all of which were collected in the interior of the State of New York. May I ask you to look them over at as early an opportunity as may suit your convenience, and to return to me the result of your determinations. I do not venture to think that you will find among them anything of especial interest. I very much regret that I am at the present moment unable to forward to you a half a dozen copies of the work of “Gramineæ and Cyperaceæ,” the number you so kindly offer to take charge of. A few species are wanting to complete further suits of the first volume, but these I hope soon to obtain. Not to permit your kind offer to pass wholly unimproved, I hereby transmit to you three copies of vols. 1 and 2 which are at the disposal of any of your botanical friends who may desire to possess the work. If an additional number of copies should be needed they can in a very short time be furnished. With high respect, I remain, dear sir, Yours truly, A. GRAY. To WILLIAM JACKSON HOOKER, LL. D., Regius Professor of Botany in the University at Glasgow. TO JOHN TORREY. SAUQUOIT, N.Y., July 9, 1835.