Down: November 14, 1880.
My dear Romanes,—Many thanks for your kind sympathy. My wife's sister was, I fully believe, as good and generous a woman as ever walked this earth.
The proof-sheets have not arrived, but probably will to-morrow. I shall like to read them, though I may not be able to do so very quickly, as I am bothered with a heap of little jobs which must be done. I will send by to-day's post a large book by Focke, received a week or two ago, on Hybrids, and which I have not had time to look at, but which I see in Table of Contents includes full history of subject and much else besides. It will aid you far better than I can; for I have now been so long attending to other subjects, and with old age, I fear I could make no suggestions worth anything. Formerly I knew the subject well.
Kölreuter, Gärtner, and Herbert are certainly far the most trustworthy authorities. There was also a German, whose name I mention in 'Origin,' who wrote on Hybrid Willows. Naudin, who is often quoted, I have much less confidence in. By the way, Nägeli (whom many think the greatest botanist in Germany) wrote a few years ago on Hybridism; I cannot remember title, but I will hunt for it if you wish. The title will be sure to be in Focke.
I quite agree with what you say about Passiflora. Herbert observed an analogous case in Crinum.
November 15, 1880.
I have just read your article. As far as my judgment goes it is excellent and could not be improved. You have skimmed the cream off the whole subject. It is also very clear. One or two sentences near the beginning seem rather too strong, as I have marked with pencil, without attending to style. I have made one or two small suggestions. If you can find my account in 'Nature' (last summer I think)[30] about the hybrid Chinese geese [being fertile] inter se, it would be worth adding, and would require only two or three lines. I do not suppose you wish to add, but in my paper on Lythrum, and I think requoted in 'Var. under Dom.' vol. ii. 2nd edit. bottom of page 167, I have a good sentence about a man finding two vars. of Lythrum, and testing them by fertility, and coming to egregiously wrong conclusion.
I think your idea of reference to best books and short history of subject good. By the way, you have made me quite proud of my chapter on Hybridism, I had utterly forgotten how good it appears when dressed up in your article.
Yours very sincerely,
Charles Darwin.