Mrs. Gray is absent while I write, or she would add her best regards and best wishes to my own for a happy New Year to you all. TO C. W. ELIOT. BOTANIC GARDEN, CAMBRIDGE, January 1, 1873. MY DEAR PRESIDENT ELIOT,--Will you kindly present the inclosed communication to the corporation at its next meeting. I need not say to you that I could not take so serious a step as this without much consideration, and that I would not do it if I were not confident that the department which I have served in the university for almost thirty-one years need not now suffer by my withdrawal. I am warned also by growing experience of the fact that the needful work which I could formerly do with ease can now be done only by effort, followed by exhaustion and other unpleasant effects, which may be expected to increase; and it is clear that I have left to me, at best, barely time enough, when rigorously economized, to complete the works for which I have long been pledged, and without the accomplishment of which my life will have been largely a failure. The corporation will perceive that I do not intend to be idle, but to concentrate what energies remain to me upon the kind of work for which I am best--and indeed peculiarly--fitted, both by disposition and by more than forty years of preparation. As this work proceeds, the herbarium of the university, always requiring attention during its continued increase, will be put into the condition in which I should leave it, with its value greatly enhanced. In view of this, and of the fact that the herbarium forms an important part of the apparatus of instruction here, I trust the corporation will think it reasonable to allow me the possession of the house I live in, in recompense of my services as curator of the herbarium. I offer my resignation unconditionally, that the corporation may have, as it should, the whole matter in its hands without embarrassment. If it be desired to keep my name for the present upon the catalogue, and especially if the corporation should prefer not to place a permanent incumbent just yet in the Fisher professorship, I would in that case take the liberty to suggest that the present very capable and efficient assistant, Dr. Goodale, be made adjunct professor of vegetable physiology, with salary assigned from the Fisher professorship. I remain, dear Mr. President, Very sincerely yours, ASA GRAY. _Messrs. the President and Fellows of Harvard College_: HONORABLE AND DEAR SIRS,--The time has arrived when I may, as I think without detriment to the university, retire from the professorship to which I was appointed in the spring of 1842; and I hereby tender my resignation of it, to take effect at the close of the present academic year, when I shall have completed thirty-one years of service. I trust that I may still be useful to the university; and if agreeable to the corporation I should like to continue to be Curator of the Herbarium. With sincere regard, I am your obedient servant,