Hoped to meet CD at the Linnean Society to discuss pigeon and poultry breeding experiments.
Muswell Hill | N.
My dear Sir
I hoped to have the pleasure of seeing you at the Linnean society, and much regret the cause of your absence
There were one or two points connected with my little experiment that I should have been very glad to have asked you respecting, such as your suggestion to employ Carriers and Turbits, instead of Barbs and Fantails.—
In accordance with your suggestion I have procured some Silk fowls (two very good black skinned hens) and a Spanish Cock. I am devoting a small paddock to them and will hatch several clutches of chickens— Do you think that the two hens will be sufficient or can you suggest any modification of the experiment.— Would it be desirable or necessary to have a second set to cross their offspring with those of the first— If so I would make arrangements to procure them— —
Trusting to hear of improvement in your health | Believe me | Very truly yours | W B
C Darwin Esq
- f1 3995.f1Although CD was in London from 4 to 14 February 1863 (see `Journal' (Correspondence vol. 11, Appendix II)), illness prevented his attendance at the meeting of the Linnean Society on 5 February, at which his paper `Two forms in species of Linum' was read (see letter to W. B. Tegetmeier, 19 February ).
- f2 3995.f2On 1 December 1862, the council of the Royal Society of London resolved to grant £10 to Tegetmeier for `experiments on the cross-breeding of pigeons' (Royal Society, Council minutes, 1 December 1862). CD sent Tegetmeier a manuscript list of the crosses he had made between different pigeon varieties, adding that: `If I were going to try again, I would prefer Turbit with Carrier or Dragon' (Correspondence vol. 10, letter to W. B. Tegetmeier, 27 [December 1862] and n. 4); CD explained this preference in his letter to W. B. Tegetmeier of 19 February . CD's changing views on the causes of cross and hybrid sterility had prompted him to seek further experimental evidence on the question, especially with regard to animals (see Correspondence vol. 10, Appendix VI). Between 1863 and 1865, Tegetmeier carried out a series of crosses between varieties of pigeon designed to test the fertility of their hybrids; he tested the progeny of three generations without finding `any sign of want of fertility' (see letter from W. B. Tegetmeier, 29 June -- 7 July 1863, and letter from W. B. Tegetmeier, 13 March 1865, Calendar no. 4785). CD provided a brief summary of the results of his own crossing experiments with pigeons in Variation 1: 192 n. 19.
- f3 3995.f3In his letter of 27 [December 1862] (Correspondence vol. 10), CD asked Tegetmeier to obtain and cross `a Spanish Cock & a couple of white Silk hens' in order to ascertain whether the offspring bred well and to test for prepotency in the transmission of silky plumage. CD had conducted similar trials in 1859 and 1860 (see CD's Experimental notebook (DAR 157a), pp. 41--2, 49--50). See also Correspondence vol. 7, letter to W. B. Tegetmeier, 13 September , and Correspondence vol. 8, letter to W. B. Tegetmeier, 24 [February? 1860]. CD concluded that `Silk-fowl' seldom transmitted their silky plumage when crossed with any other variety of chicken (Variation 2: 67). Tegetmeier's experiments confirmed CD's observations (Tegetmeier 1867, p. 224). There is an annotated copy of Tegetmeier 1867 in the Darwin Library--CUL (see Marginalia 1: 800--3).
- f4 3995.f4See letter to W. B. Tegetmeier, 19 February .