To A. R. Wallace 27 March 1
4 Chester Place | R. Park. N.W | Until April 1st.
My dear Wallace
My son has failed in your problem & says that it is “excessively difficult”: he says you will find something about it in Thompson & Tait Nat Philos (Art. 649).2 He has, however sent the solution, if the plate rested on a square rim, but he supposes this will not answer your purpose; nevertheless I have forwarded it by this same post.— It seems that the rim being round makes the problem much more difficult.—
I enclose my photograph, which I have received from Down.3
I sent your answer to George on his objections to your argument on sterility but have not yet heard from him.—4 I dread beginning to think over this fearful problem, which I believe beats the plate on the circular rim; but I will sometime. I foresee, however, that there are so many doubtful points, that we shall never agree.
As far as a glance serves it seems to me, perhaps falsely, that you sometimes argue that hybrids have an advantage from greater vigour, & sometimes a disadvantage from not being so well fitted to their conditions.— Heaven protect my stomach whenever I attempt following your argument.—
Your’s most sincerely | C. Darwin
There are so many doubtful points on the problems relating to sterility that they will never agree.
Please cite as
Darwin Correspondence Project, “Letter no. 6058,” accessed on 28 May 2016, http://www.darwinproject.ac.uk/DCP-LETT-6058