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Darwin Correspondence Project

To J. D. Hooker   5 July [1856]1


July 5th

My dear Hooker

I wrote this morning in tribulation about Tristan d’Acunha. The more I reflect on your antarctic Flora, the more I am astounded. You give all the facts so clearly & fully, that it is impossible to help speculating on the subject; but it drives me to despair, for I cannot gulp down your continent;2 & not being able to do so gives in my eyes the multiple creationists an awful triumph. It is a wondrous case,3 & how strange that A. Decandolle should have ignored it,4 which he certainly has, as it seems to me.

I wrote Lyell a long geological letter about continents,5 & I have had a very long & interesting answer;6 but I cannot in the least gather his opinion about all you continental extensionists; & I have written again beseeching a verdict.7

I asked him to send to you my letter,8 for as it was well copied it would not be troublesome to read; but whether worth reading I really do not know: I have given in it the reasons which make me strongly opposed to continental extensions.

I was very glad to get your note some days ago:9 I wish you would think it worth while, as you intend to have the Laburnum case translated, to write to “Wien” (that unknown place) & find out how the Laburnum has been behaving since that year: it really ought to be known.—10

The Entada is a beast;11 I have never differed from you about the growth of a plant in a new island being far harder trial than transportal, though certainly that seems hard enough. Indeed I suspect I go even further than you in this respect; but it is too long a story.—

Thanks you for the Aristolochia & Viscum cases: what species were they? I ask, because oddly these two very genera I have seen advanced as instances (I forget at present by whom, but by good man) in which the agency of insects was absolutely necessary for impregnation. In our British diœcious viscum, I suppose it must be necessary. Was there anything to show that the stigma was ready for pollen in these two cases? for it seems that there are many cases in which pollen is shed long before stigma is ready.

As in one Viscum insects carry sufficiently regularly for impregnation pollen from flower to flower; I shd. think that there must be occasional crosses even in an hermaphrodite Viscum. I have never heard of Bees & Butterflies, only Moths producing fertile eggs without copulation.—12

What a case of Aldrovanda!

I remember Decandolle, (the father) quotes it as wonderful case even in two rivers of Europe.13

With respect to Ray Soc. I profited so enormously by its publishing my Cirripedia, that I cannot quite agree with you on confining it to translations; I know not how else I could possibly have published.—

I have just sent in my name for £20 to Linn. Soc;14 but I must confess I have done it with heavy groans, whereas I daresay you gave your £20 like a light-hearted gentleman.

My dear Hooker | Ever yours | C. Darwin

Wollaston speaks strongly about the intermediate grade between two varieties in insects & mollusca, being often rarer than the two varieties themselves.15 This is obviously very important for me, & not easy to explain. I believe I have had cases from you. But, if you believe in this, I wish you would give me a sentence to quote from you on this head. There must, I think, be a good deal of truth in it; otherwise there could hardly be nearly distinct varieties under any species, for we should have instead a blending series as in Brambles. & Willows.—


This letter was the second written to J. D. Hooker on 5 July 1856. CD states that his first letter was written in the morning and that he had also written to Charles Lyell (see letter to Charles Lyell, 5 July [1856]). The original order of the letters has been preserved for clarity.
Hooker had proposed a large Antarctic land mass that, at different times, linked South America, Australia, some Pacific islands, and the Antarctic islands with New Zealand (J. D. Hooker 1853–5, 1: xxi–xxiv). He had alluded to this suggestion in his earlier volume on Antarctic botany (J. D. Hooker 1844–7, 2: 210–11).
A. de Candolle 1855.
Letter to Charles Lyell, 25 June [1856].
Letter from Charles Lyell, [1 July 1856].
CD reiterated this intention in his letter to J. D. Hooker, 13 July [1856]. It seems that Lyell did not forward the letter to Hooker, for CD eventually had a copy made of his own draft (the latter was retained at Down) and forwarded it to Hooker, enclosed with his letter to J. D. Hooker, 30 July [1856].
Letter from J. D. Hooker, [26 June or 3 July 1856].
A. P. de Candolle 1820, p. 406, in which Augustin Pyramus de Candolle discussed the distribution of the freshwater plant Aldrovanda in the river basins of the Po and the Rhône. The passage is marked in CD’s copy of the work (Darwin Library–CUL); in the margin CD wrote in pencil: ‘& at Calcutta Hooker’.
A subscription was opened in June 1856 to pay the expenses for moving the Linnean Society’s quarters from Soho Square to Burlington House (Gage and Stearn 1988, p. 51). CD’s Account book (Down House MS) has an entry for this payment on 22 February 1857.
Wollaston 1856, pp. 105–6.


Troubled by JDH’s connection between Antarctic island flora and Fuegia, which CD sees as part of a general relation to southern circumpolar flora. Encloses list [not found] of plants from Tristan d’Acunha.

Letter details

Letter no.
Charles Robert Darwin
Joseph Dalton Hooker
Sent from
Source of text
DAR 114: 167
Physical description

Please cite as

Darwin Correspondence Project, “Letter no. 1919,” accessed on 23 August 2017,

Also published in The Correspondence of Charles Darwin, vol. 6