RECORD: Darwin, C. R. n.d. Sleep or Heliotropism. CUL-DAR209.7.143. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. 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-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).
[143]
Sleep— or Heliotropism
Pringsheim has recently found that seen under the microscope the destruction of chlorophyll is destroyed in a few minutes by by the action of concentrated light from the sun, in the presence of oxygen.
(Diurnal Sleep)
[Movement in plants, p. 446, n*: "* 'Die Näturlichen Einrichtungen zum Schutze des Chlorophylls,' etc., 1876. Pringsheim has recently observed under the microscope the destruction of chlorophyll in a few minutes by the action of concentrated light from the sun, in the presence of oxygen. See, also, Stahl on the protection of chlorophyll from intense light, in 'Bot. Zeitung,' 1880."]
[143v]
Waterer
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022