The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. & Francis Darwin. n.d. Take 1 dr of the (1 gr to 20 oz) initial mixture. CUL-DAR55.162. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and John van Wyhe, edited by John van Wyhe 1.2023. RN2

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).

[162]

Take 1 dr of the (1 gr to 20 oz) initial mixture

& add 24 dr to get 1 gr to 500 oz

29 dr ― 600

34 dr ― 700

39 dr ― 800

& so on

Describe in detail my method of proceeding — W. twice distilled, same use — same measuring glass — Everything washed incessantly

Temperature of Plants solution & water the same

1 dr to 19 dr. of water for 400

1 dr to 9 dr ― for 200

1 dr to 14 ― 300

[162v]

1 gr to 700 = 5600
1/160 (1 + x) = 1/5600
1 + x = 70/2 = 35
x = 34

1 to 800 = 6400
1 + x = 6400/160 = 40

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)