Many of EB's remarks about Origin [4th ed. (1866)] are new to CD.
Thinks of writing a short essay on man.
Struck by EB's remarks about orang. They are similar to Carl Vogt's remarks on origin of man from distinct ape families.
Thinks similarity of orang to Malay must be accidental.
Will send Variation when it is published.
Down. | Bromley. | Kent. S.E.
My dear M
I have been very much interested by your remarks on the ``Origin''; many of which are
quite new to me, such as those on mimicry. I knew already some
few of the other facts which you mention. I am thinking of writing a short essay on Man
& have consequently been much struck with your remarks on the Orang. Do you know
C. Vogt's nearly similar remarks on the origin of Man from distinct
Ape-families, founded on Gratiolet's observations on the brain? I think you cannot
object to my cautiously alluding to your observation on the similarity of the Orang
& Malay &c: I think the similarity must be accidental, & I would
confirm this by your observation on the S. American genus with respect to the
Negro. I do not know what to think about the almost parallel
case of Bats. If I had known that you w
You gave me long since two printed pages Royal 8
I have picked up more facts on sexual characters, even when you are not discussing the
subject from your writings than from those of any one else. Thus in the last
How I wish that you w
Can you tell me whether the canine teeth differ in the sexes in the true Carnivora? But I must not ask any more questions except one:—Do you still maintain the law on sexual plumage in Birds as given in the sheets above referred to? Yarrell gives a rather different law, dependent on there being an annual change in plumage.
But I have written to you at quite unreasonable length— pray forgive me & believe me yours very sincerely— | Ch. Darwin
- f1 5413.f1The year is established by the relationship between this letter and the letter from Edward Blyth, 19 February 1867.
- f2 5413.f2For Blyth's remarks on the fourth edition of Origin, see the letter from Edward Blyth, 19 February 1867.
- f3 5413.f3For CD's intended publication on humans, see the letter to William Turner, 11 February  and the letter to Fritz Müller, 22 February  and n. 12. For Blyth's comments on the orang-utan and on human resemblances to apes and monkeys, see the letter from Edward Blyth, 19 February 1867 and nn. 11 and 12. In Lectures on man (C. Vogt 1864, pp. 464--6), Carl Vogt discussed the three `ape-types', the orang-utan, chimpanzee, and gorilla, and ways in which their features approached human features; in making these comparisons, he quoted Louis Pierre Gratiolet's studies of cerebral structure. CD discussed Vogt's idea in Descent 1: 230; he cited C. Vogt 1864 and referred to Gratiolet's conclusions without citing their source, Gratiolet ; CD did not allude to Blyth's views. CD viewed the conclusions of Vogt and Gratiolet as unlikely (see Descent 1: 230--1). An annotated copy of C. Vogt 1864 is in the Darwin Library--CUL (see Marginalia 1: 824).
- f4 5413.f4In his letter of 19 February 1867, Blyth sent comments on the fourth edition of Origin, and discussed resemblances between particular bat genera and primate groups. CD also refers to Variation, which was published in January 1868.
- f5 5413.f5CD stayed at Erasmus Alvey Darwin's home in London from 13 to 21 February 1867 (see letter to J. D. Hooker, 8 February , n. 21); before falling ill, he had hoped to walk with Blyth in the Zoological Gardens, Regent Park (see letters to Edward Blyth, [18 February 1867] and [19 February 1867]).
- f6 5413.f6CD also referred to these pages in his letter to Blyth of [18 February 1867]. They were galley proofs of a portion of Cuvier's animal kingdom translated from Georges Cuvier's Règne animal by Blyth (Cuvier 1840 or 1849 (new edition), pp. 158--9; these are pages 146 and 147 in Cuvier 1859 (reprint of the new edition)). The pages, annotated by both CD and Blyth, are in DAR 84.1: 179--80.
- f7 5413.f7CD marked a passage mentioning the nuptial plumage of plovers, sandpipers, and some gulls and terns in the 16 February 1867 issue of Land and Water, p. 84; the annotated clipping entitled `Arrivals in the zoological gardens' is in DAR 84.1: 182 and is not signed. CD wrote `Blyth' at the bottom. He cited the article in Descent 2: 84 n. 77. CD discussed birds with similar plumage in both genders, even when moulting twice a year, in Descent 2: 80--6, with references to plovers, birds closely related to sandpipers, and the ptarmigan; see also ibid., pp. 180, 208--19.
- f8 5413.f8CD made a general reference to Blyth's observations of feral humped cattle (Bos indicus) in the Indian Field 1858, in Variation 1: 79 n. 33. CD cited Blyth, but not an article in the Indian Field, on colour differences in antelopes, in Descent 2: 288.
- f9 5413.f9See n. 6 above. Blyth added editorial notes describing various sexual plumages according to different groups of species in Cuvier 1840 and 1849, pp. 158--9; in the last paragraph of the note on p. 159, he discussed the juvenile plumage in birds that undergo a double moult. In DAR 84.2: 2, CD listed `Blyths Laws (corrected)'; these include three laws of the plumage of juvenile birds in relation to the plumage of the adults. CD also refers to the third of three laws listed in William Yarrell's A history of British birds (Yarrell 1843, 1: 159); this states that when adult birds assume breeding plumage different from winter plumage, the young birds' plumage is intermediate `in the general tone of its colour' between the winter and breeding plumage of the parent birds; his first two laws are on juvenile plumage in relation to sexual adult plumage. The first volume of Yarrell 1843 is in the Darwin Library--CUL and is heavily annotated, including the pages on sexual plumage (see Marginalia 1: 883--5). CD also wrote out six laws of plumage in his notes (see DAR 84.2: 3--4). In Descent 2: 186--223, CD listed the `classes of cases or rules under which the differences and resemblances, between the plumage of the young and the old, of both sexes or of one sex alone, may be grouped'.