RECORD: Darwin, C. R. n.d. [calculations concerning grains of salt]. CUL-DAR60.2.59-59v. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed and edited by John van Wyhe 6.2025. RN1
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).
59
[calculations concerning grains of salt]
.6467 of this grain was salt
∴ .6467/1,552,000 of a grain acted
1,552,000 [÷] .6467 2399876.3
1/2,399,876 1/3 of a grain approximately
1/2,400,000th of a grain of anyhdrous salt
[in Darwin's hand:] Calculation for anyhdrous phosphate of ammonia (Lense)
59V
1/1,552,000 of a grain; but this grain contained 35 35.33 per cent by weight of Water of crystallisation— What fraction of anhydrous salt is the above fraction equal to
59Vv
4 6.5 / 1.5 / 15
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 11 December, 2025