The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. [1880-1881]. Work in at end of Chapt [Earthworm research notes]. CUL-DAR64.2.6. Edited by John van Wyhe (The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

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 volume CUL-DAR64 contains research materials for Earthworms.

Work in at end of Chapt. — field for 10 years

Maer (p. 45) after 14 3/4 years, sandy dry pasture but good average accumulation .23, as 3 1/2 inches accumulated as far as I cd estimate. — nearly 11 annually

Maer (p. 48) swampy field, after 21 years, average 19 in annually — thickness about 4 inches.

Maer (p. 49) very swampy field after 7 years average .21 inch — 2 inches accumulated

Down — after 29 years — average .2 about But on Stony field only average .0833 (i.e 9996 in 12 years) after 30 years

Dr K. accumulated Nice number 10 or 12 mortar 14.58 tons per acre in years ["Dr. King, the superintendent of the Botanic Garden in Calcutta"]

Bottom of Big valley, judging from 40 days accumulated

tons? a bulk lb 1 tons

Terrace 7 1/2 tons

Common 16.1 tons

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