RECORD: Darwin, C. R. and William E. Darwin. n.d. [Amount of earth to cross a base line per annum]. CUL-DAR63.68. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 6.2021. 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.

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Suppose a square acre to be marked out on the sloping field then the base line marked out along the foot of the slope well be 70 yards long. The 168 cubic inches of earth will cross this base line per annum.

Generally mark a level line on the side of the hill of given length (say a yard) estimate how much earth crosses that line per annum.

1v

Fig. 1

Fig. 2

arrangement of Plate IV

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

File last updated 25 September, 2022