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Darwin Correspondence Project

DCP-LETT-2946

To Daniel Oliver   12 [October 1860]1

15 Marine Parade | Eastbourne

12th

My dear Sir

The Drosera & leaves of Dionæa. arrived quite safe. I am very much interested by them.—   Pray give my best thanks to Sir William, & accept them yourself.—2

I am very busy & get my constant enemy headach; so will not write any more, but I have got a good deal to say first day I can.

Will you try one easy experiment.—   Drop on sensitive hair of Dionæa one drop gently of pure water; & get solution of Carbonate of Ammonia 6 six gr. to 2 two oz of distilled water, & drop this & see if it immediately or within hour or two causes movement. This will not injure leaf.—   Perhaps safer to get 4 gr to 2 oz water3    Also one drop of the C. of Ammonia on disc of leaf.—   I want so much to know whether movement analogous of Dionæa & Drosera.—4

Yours very truly | C. Darwin

Footnotes

1
This and the following letter are dated by the relationship to the letter to Daniel Oliver, 14 October [1860].
2
William Jackson Hooker had agreed to sending CD a living specimen of Drosera spathulata and some detached leaves of Dionaea. See letter to Daniel Oliver, [10 October 1860]. There is a note dated 12 October 1860 (headed ‘Dionæa from Kew’) in DAR 54: 2–3.
3
Oliver wrote on the letter: ‘(ordered 2 grs. to 1oz pure in disd. water)’.
4
CD had hoped to obtain a living specimen of Dionaea so that he could conduct his own comparative experiments (see letter to Daniel Oliver, [29 September 1860]).

Summary

Requests DO apply carbonate of ammonia to sensitive hair of Dionaea and measure reaction time. Wants to compare Drosera and Dionaea.

Letter details

Letter no.
DCP-LETT-2946
From
Darwin, C. R.
To
Oliver, Daniel
Sent from
Eastbourne
Source of text
Down House (MS 10: 16)
Physical description
4pp †

Please cite as

Darwin Correspondence Project, “Letter no. 2946,” accessed on 1 October 2016, http://www.darwinproject.ac.uk/DCP-LETT-2946

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