... You should study Wyman’s observations in his own papers. He is always careful to keep his inferences close to his facts, and is as good an experimenter, I judge, as he is an observer. He has a new series of observations to publish. I think that he has not at all pronounced in favor of spontaneous generation, but I will bet on his experiments against Pasteur, any day. TO CHARLES WRIGHT. November 23. You may well complain that I neglect you. But-- 1. I had, till now, nothing special to write. 2. I have been daily expecting to hear from Grisebach, and have sheets to send you, or the copies via Westermann. But not a bit of it yet. The conquest of Hanover by the Prussians seems to have annihilated Grisebach. 3. I have been, am so--_busy_ is not the word for it. I can’t think of any to express it. I suppose that I have now lying by me more than fifty unanswered letters, though I keep answering the most pressing as fast nearly as they come in. But the rest get neglected, inevitably. I read your letters and follow your work in Cuba with interest. I want you to get all the plants you can (but I see not that you can exhaust Cuba), and then come and settle down here, and work up, as you only can, a nice Flora Cubana. That you are bound to do, just as I am to do the Flora of North America. I see some faint prospect that I may yet, and before very long, be able to sit down to it. But you and I are bound to do these two things yet!... The seeds I put loose in this sheet are Cinchona officinalis. Get the tree introduced into your cooler region, that is, the Caffetals of east Cuba, and the tree will be commercially important in time, and you will be a benefactor of your species. Enough for once. Ever your old friend, A. GRAY. TO GEORGE ENGELMANN. November 20, 1866. DEAR ENGELMANN,--Yes, I have a heap of unanswered letters from you. But I have not one moment of time. I have copy of “Manual” in printer’s hands up to Compositæ, and am only now two days ahead; have been only two hours ahead day after day!! It is awful! So much other work too!... If I could get five hundred to one thousand more a year I would at once resign professorship and salary.... I am well, never more hearty; but worked like a coach-horse. I have got my fund raised for the Garden: small, but we have now clear $2,500 or $2,600 a year for Garden. February 27, 1867. How much I am indebted to you! No one else who undertakes to help me ever makes out much, at least to save me time and trouble.... I have not time to write details of the little I know about the National Academy. But I have seen enough to make it clear that I should not be taking any more responsibility about it. So last month I sent my resignation. They have put me on the list of Honorary Members. The American Academy is as much as I want to attend to, and I do my duty to society in looking well after that.... TO A. DE CANDOLLE. September 10, 1866.