CD makes progress with barnacles. Describes "supplemental" males in detail. In working out metamorphosis, their crustacean homologies followed automatically.
CD opposes appending first describer's name to specific name.
Down Farnborough Kent
My dear Hooker
I have just been much pleased with getting your tiny note
& above all with your statement that you are free from your heart-pains. For
Heaven sake take care of yourself. I have been a good-for-nothing dog for not having
written to you long ago; it has not been from forgetting you; for if I had no other
memento I have had your name in my list of unanswered correspondents for an awful
period. But I have had a rather extra dose of unwellness all this summer; an extra
number of correspondents, & an extra amount of work. Owing to the kindness of
your Father & Miss Henslow, I have seen a good many of your letters, & know what you have been doing. I was much grieved to
hear sometime ago how ill Miss Hooker had been. You seem to have had great Botanical
success, but I declare it made me tremble to see how very
hard you work. Now please to remember that though your letters give me great pleasure, I
deliberately repeat my request that you do not write to me: I know from former
experience how much time letters consume.— As for news you
I am extremely much obliged to you for not forgetting my species theory: pray thank Mr Hodgson cordially for me for the pamphlets; I have long been familiar with his name. I know well Pallas' memoir. I have not lately done much in the species line, for I am becoming rapidly a complete Cirripede in my mind. I remember saying to you at Oxford (how pleasant a time that was!) that I felt as if a Barnacle had never been created; I shall never be able, I fear, to say that again. Though I have done little about species, I have struck up a cordial correspondence with a first-rate man, the author of the articles on Ornamental Poultry in Gardener's Chronicle.—
I have just finished Sir J. Ross' Voyage;
it is a poor book with little interest except the escapes from the ice: I except of
course your Botanical summaries, which I have copied out in abstract, for they struck me
as eminently well done. How I wish you had written the whole voyage. There was one other
extract, which pleased both Mrs
I am glad to hear that you are struck with my case of the Supplemental males: I have
lately reworked them most carefully. They have no mouth or stomach, but the natatory
larva or rather pupa (for the larva in 2d stage in no cirripede, I find,
has a mouth) fixes itself on the hermaphrodite, develops itself into a great testis!
& then dies & is succeeded by a fresh crop of these temporary
Supplemental males. I have caught one lately at right epoch & its entire
contents were a great sperm-receptacle full of perfect zoosperms. I believe I have now got a far more curious case, but of it I
will say nothing till more positive.— I have been delighted of late in having
made out minutely the metamorphoses & consequently without any theory the
homologies with ordinary crustacea. The shell of a Balanus, & even the whole
peduncle & shell of Lepas is certainly the 3 anterior segments
of the head, wonderfully modified & enlarged so as to receive the
14 succeeding cephalic, thoracic & abdominal segments; I declare I know
of no more surprising metamorphosis, & it is perfectly clear &
evident.— Heaven forgive me for inflicting on you
such a lecture on Barnacles; but I forget, that you are well entered on them, & I need not apologise. Oh if I cd but
make out the circulatory system, I think I shd have pretty well finished
their anatomy. I have lately been trying to get up an agitation (but I shall not succeed
& indeed doubt whether I have time & strength to go on with it) against
the practice of naturalists appending for perpetuity the name of the first
describer, to species. I look at this as a direct premium to
hasty work, to naming instead of describing. A species ought to have a
name so well known, that the addition of the author's name would be superfluous
& a pi<ece> of empty vanity. At present, it would not do to give
mere specific name, but I think zoologists might open the road to the omission, by
referring to good systematic writers instead of to first describers. Botany, I fancy has
not suffered so much as Zoolog. from mere naming; the characters, fortunately,
are more obscure. Have you ever thought on this point? Why
When you write to Falconer pray remember me affectionately to him: I grieve most sincerely to hear that he has been ill.
My dear Hooker, God Bless you & fare you well— Your sincere friend, | C. Darwin
- f1 1202.f1Letter from J. D. Hooker, 24 July .
- f2 1202.f2Hooker's letters to William Jackson Hooker and extracts of his letters to Frances Henslow are preserved at the Royal Botanic Gardens, Kew (Indian letters, 1847–51).
- f3 1202.f3William Jackson Hooker publicised his son's achievements in a series of extracts from his letters (see n. 2, above) under the title ‘Botanical mission to India’ in the London Journal of Botany and Hooker's Journal of Botany and Kew Garden Miscellany. CD's particular reference is probably to W. J. Hooker ed. 1848; but see also K. M. Lyell ed. 1881, 2: 146, in which Charles Lyell reported in a letter dated 2 August 1848 that J. D. Hooker had found three new species of magnolia in the Himalayas in one day.
- f4 1202.f4Edward Forbes married Emily Marianne Ashworth, youngest daughter of General Sir C. Ashworth, on 31 August 1848 (Wilson and Geikie 1861, p. 444).
- f5 1202.f5CD is referring to the occasions on which Forbes, Hooker, Hugh Falconer, and others visited him at Down House.
- f6 1202.f6Lyell had been residing at his father's house in Kinnordy for the summer and visited Queen Victoria and Prince Albert at Balmoral Castle, some 50 miles to the north of Kinnordy. The prince consort had just taken over the lease of the castle and the royal couple resided there for the first time in September 1848. Lyell described part of his visit in a letter to Gideon Mantell (K. M. Lyell ed. 1881, 2: 148).
- f7 1202.f7CD's abstract of Pallas 1780 is in DAR 196.5.
- f8 1202.f8Edmund Saul Dixon, the author of a book on ornamental poultry (1848) that was much quoted by CD in Variation. Little correspondence between the two men has, however, survived. In Dixon 1848, an annotated copy of which is in the Darwin Library–CUL, Dixon quotes from letters from Darwin (pp. xii–xiii):
Mr. Darwin's discovery, the result of his great industry and experience, that “the reproductive system seems far more sensitive to any changes in external conditions, than any other part of the living œconomy,” confirms my suspicion of the extreme improbability of the origination of any permanent, intermediate, reproductive breed by hybridising… . Mr. Darwin suggests, “If you ever had it in your power fairly to test the possible fertility of the half-and-half birds inter se, I certainly think you would confer a real service on Natural History.”
- f9 1202.f9Ross 1847, the official account of the Antarctic voyage, to which Hooker contributed botanical notes and illustrations. CD recorded on 17 September 1848 that he had completed reading this work (DAR 119; Correspondence vol. 4, Appendix IV).
- f10 1202.f10The passage describing the cattle hunt in the Falklands is introduced by the following statement: ‘I am glad to have the opportunity of introducing here an interesting account of the wild cattle hunt, furnished to me by an officer who accompanied the party in their first successful chase’ (Ross 1847, 2: 245). Hooker had written the account (see second letter from J. D. Hooker, 3 February 1849).
- f11 1202.f11CD had informed Hooker about his discovery of males complemental to hermaphroditic cirripedes in letter to J. D. Hooker, 10 May 1848. The fact that these organisms contained ‘zoosperms’ provided proof that they were true males.
- f12 1202.f12CD based his homological analysis of Cirripedia upon a comparison between an archetypal cirripede and the archetypal crustacean as depicted by Henri Milne-Edwards (Milne-Edwards 1834–40); this idealisation is represented in the woodcut found in Living Cirripedia (1851): 28. Milne-Edwards established twenty-one segments in Crustacea, the number of various cephalic, thoracic, and abdominal segments depending on the mode of life and the particular functional role each played in different groups. CD identified seventeen of the twenty-one crustacean segments in cirripedes, ‘the four missing ones being abdominal, and, I presume, the four terminal segments’ (Living Cirripedia (1851): 27).
- f13 1202.f13Hooker had a personal interest in barnacles beyond his friendship with CD; he had spent the early months of his Antarctic voyage, 1839–43, working on marine organisms, particularly the Crustacea (L. Huxley ed. 1918, 1: 69).
- f14 1202.f14For CD's efforts to change some of the British Association's recommended rules of nomenclature, see his letter to H. E. Strickland, 29 January , and the following correspondence. In 1842 CD had been a member of the British Association committee asked to draw up a report on rules for zoological nomenclature (Correspondence vol. 2, letters to H. E. Strickland).