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Darwin Correspondence Project

From W. C. Marshall   25 September [1878]1

Derwent Island | Keswick

Sept. 25th.

Dear Mr. Darwin

I am sending you with this a plant which I suspect of being insectivorous, you will perhaps remember that I sent Horace a specimen of this; last year, wh. reached him so withered as not to be recognisable.2 I find that the flower, wh. was common in one or two beds in this garden last year, has hardly appeared at all this year; and the plant wh. accompanies this is the only one I can find at this time. I have been unable to make any further observations & can only state that at times great numbers of minute insects adhere to the plant; in most cases to the under side of the leaves, & that the leaves sometimes show discoloured spots where the insects rest.

I hope this plant may at any rate enable you to determine the species & get more specimens if you think the case worth observing. (There are insects on the plant sent.) I can probably send you more next year if you want them, as I have told the gardener to preserve the plant if he finds it.

I noticed some very fine & greedy pinguiculas this year, I was astonished by the numbers of flies they had caught & send you the butchers list of two fine plants I gathered at the end of July on Sty Head Pass.3

leaf Plant A leaf Plant B
1 } withered but many flies 1 } withered & remains of flies numerous but not distinct enough to count
2 2
3 36 3
4 34 4 22
5 26 5 57
6 40 6 7
7 16 7 21
8 12 8 22
9 9 9 19
10 2 10 11
175 11 5 & 2 seeds
12 0
164

Allowing for the old leaves on wh. the remains of the flies were so decayed as to be un-countable & for the 2 or 3 un-expanded leaves on each plant, I am sure it is well within the mark to say that they must devour 200 flies a piece during the season.

These were plants selected as being fine, but I am certain I could have found hundreds like them, the weather had been very fine.

If you wish to send me any message about these plants I shall be at 122 Mount St. next week.

yrs. very truly | W. C. Marshall

Footnotes

The year is established by the relationship between this letter and the letter to W. C. Marshall, 27 September [1878].
Marshall and Horace Darwin had been students together at Trinity College, Cambridge, and Marshall had previously made observations on insectivorous plants at CD’s request (see Correspondence vol. 22, letter to W. C. Marshall, 8 June [1874], and letter from W. C. Marshall, 5 September [1874]; see also Insectivorous plants, pp. 369–70). The plant sent to Horace Darwin has not been identified; see also letter to W. C. Marshall, 27 September [1878].
Pinguicula: butterwort. Sty Head Pass is a mountain pass above Seathwaite in the Lake District.

Bibliography

Correspondence: The correspondence of Charles Darwin. Edited by Frederick Burkhardt et al. 29 vols to date. Cambridge: Cambridge University Press. 1985–.

Insectivorous plants. By Charles Darwin. London: John Murray. 1875.

Summary

Observations on insectivorous plants.

Letter details

Letter no.
DCP-LETT-10173
From
William Cecil (Bill) Marshall
To
Charles Robert Darwin
Sent from
Derwent Island
Source of text
DAR 86: B1–2
Physical description
ALS 4pp

Please cite as

Darwin Correspondence Project, “Letter no. 10173,” accessed on 25 April 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-10173.xml

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