Discusses S. S. Haldeman's paper ["Enumeration of the recent freshwater Mollusca", Boston J. Nat. Hist. 4 (1844): 468–84].
Centres of species origin.
Describes his corrections of Origin.
Down Bromley Kent
My dear Lyell
It was extremely kind of you to take so much trouble to tell me about Haldeman's paper, which I read several years ago & abstracted, & I have just looked at my abstract. I well remember thinking it a very clever paper; but I did not find much of any actual use to me. I think I have quoted him in my large Book about ranges of varieties; but in my present condensed volume, I have not alluded to the paper. The speculations approach mine & Wallace's, but did not on any point seem to me identical. Some remarks on the young of some fresh-water shell struck me most, apparently a modified sea-mollusc.—
You ask about specific centres, if you change terms into specific areas, my theory quite requires them; i.e. it is, I think, next door to an impossibility that the same species should have been formed identically the same in any two areas. This point is discussed in my volume.—
I am working very hard, but get on slowly for I find that my corrections are terrifically heavy, & the work most difficult to me. I have corrected 130 pages; & the vol: will be about 500. I have tried my best to make it clear & striking; but very much fear that I have failed, so many discussions are, & must be, very perplexing.— I have done my best. If you had all my materials, I am sure you would have made a splendid Book. I long to finish, for I am nearly worn out.
My dear Lyell | Ever yours most truly | C. Darwin
- f1 2470.f1Dated by CD's reference to working on the proofs of Origin.
- f2 2470.f2See letter from Charles Lyell to T. H. Huxley, 17 June 1859. CD had read Haldeman 1843–4 in May 1845 (Correspondence vol. 4, Appendix IV, 119: 16a). Samuel Steman Haldeman's paper discussed the geographical distribution of species. CD's abstract of this paper is in DAR 74: 163–4. He cited it in Natural selection, p. 116, in his chapter on variation under nature. Lyell recorded the work in his species journal after a long entry, made on or about 17 June 1859, considering the progression of fossil forms (Wilson ed. 1970, p. 262).
- f3 2470.f3Haldeman 1843–4, pp. 475–6.
- f4 2470.f4Origin, pp. 351–6.