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Darwin Correspondence Project

To JSBurdon Sanderson   1 October [1873]1

Down, | Beckenham, Kent.

Oct 1.

My dear Dr. Sanderson.

I hear from Frank that Drosera has been behaving perversely.2 I write a line, as it may possibly have a bearing on this perversity, viz that the motor influence is sent from the excited glands more quickly & completely in a longitudinal than in a transverse direction in the lamina of the leaf.3


Yours very sincerely | Ch Darwin


The year is established by the relationship between this letter and the letter to JSBurdon Sanderson, 9 September [1873].
For CD’s experiments on the transmission of the motor impulse in the tentacles of Drosera, see Insectivorous plants, pp. 236–54.


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


Hears from Frank [Darwin] that Drosera behaves perversely. Suggests that motor influence may move longitudinally away from the excited glands.

Please cite as

Darwin Correspondence Project, “Letter no. 9081,” accessed on 13 April 2021,

Also published in The Correspondence of Charles Darwin, vol. 21