From G. J. Romanes 17 April 1881
18 Cornwall Terrace, Regent’s Park, N.W.:
April 17, 1881.
Your long letter has been most refreshing to me in every way.1
I am looking foward with keen interest to the appearance of your book on Worms, and am unexpectedly glad to hear that my letter was of any use.2
I should very much like to see the book you mention, and from what you say about sending it I shall not order it. But there is no need to send it soon, as I have already an accumulation of books to review for ‘Nature.’3
I am very glad that you think well of the Echinoderm work. Several other experiments have occurred to me to try, and I hope to be able to do so next autumn, as also the interesting experiment suggested by Frank of rotating by clockwork (as you did the plants) an Echinus inverted upon its aboral pole, to see whether it would right itself when the influence of gravity is removed.4
No doubt I must in my second book deal with instincts of all kinds, complex or otherwise.5 Your ‘speculations’ on the sand-wasp seem to me very pithy— excuse the pun suggested by the analogy of the cattle— and I think there can be little doubt that such is the direction in which the explanation is to be sought. I also think that the difficulty is mitigated by the consideration that both the ganglion of the spider and the sting of the wasp are organs situated on the median line of their respective possessors, and therefore that the origin of the instinct may have been determined or assisted by the mere anatomical form of the animals—the wasp not stinging till securely mounted on the spider’s back, and when so mounted the sting might naturally strike the ganglion. But I have not yet read Fabre’s own account, so this view may not hold. Anyhow, and whatever determining conditions as to origin may have been, it seems to me there can be little doubt that natural selection would have developed it in the way you suggest.6
I have now grown a number of seeds exposed to the flashing light, but am not yet quite sure as to the result. About one seedling out of ten bends towards the flashing source very decidedly, while all the rest, although exposed to just the same conditions, grow perfectly straight. But I shall, no doubt, find out the reason of this by further trials. It is strange that the same thing happens when I expose other seedlings to constant light of exceedingly dim intensity. It looks as if some individuals were more sensitive to light than others. I do not know whether you found any evidence of this.7
I have just found that this year again I have been too late in asking them to send me cuttings of the vine for grafting. I did not know that the sap in vines began to run so early.8
I remain ever yours, very sincerely and most respectfully, | Geo. J. Romanes.
Footnotes
Bibliography
Earthworms: The formation of vegetable mould through the action of worms: with observations on their habits. By Charles Darwin. London: John Murray. 1881.
Fabre, Jean-Henri. 1879. Souvenirs entomologiques: études sur l’instinct et les mœurs des insectes. Paris: Librairie Ch. Delagrave.
Movement in plants: The power of movement in plants. By Charles Darwin. Assisted by Francis Darwin. London: John Murray. 1880.
Romanes, George John. 1883a. Mental evolution in animals: with a posthumous essay on instinct by Charles Darwin. London: Kegan Paul, Trench & Co.
Romanes, George John. 1883b. Observations on the physiology of Echinodermata. [Read 1 March 1883.] Journal of the Linnean Society of London (Zoology) 17: 131–7.
Romanes, George John and Ewart, James Cossar. 1881. Observations on the locomotor system of Echinodermata. [Read 24 March 1881.] Philosophical Transactions of the Royal Society of London 172: 829–85.
Roux, Wilhelm. 1881. Der Kampf der Theile im Organismus. Ein Beitrag zur Vervollständigung der mechanischen Zweckmässigkeitslehre. Leipzig: Verlag von Wilhelm Engelmann.
Summary
Looks forward to reading CD’s Earthworms.
Agrees that habits of sand-wasp are determined by natural selection.
Experiment of exposing plants to flashing light gives uncertain result.
Letter details
- Letter no.
- DCP-LETT-13123
- From
- George John Romanes
- To
- Charles Robert Darwin
- Sent from
- London, Cornwall Terrace, 18
- Source of text
- E. D. Romanes 1896, p. 112
Please cite as
Darwin Correspondence Project, “Letter no. 13123,” accessed on 28 March 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-13123.xml