RECORD: Darwin, C. R. & Francis Darwin. n.d. Splendid case. The root exerted more force then when pressing through the hole in the tied stick. CUL-DAR209.5.92-93. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 5.2023. 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 volume CUL-DAR209.5 contains materials for Darwin's book Movement in plants (1880).
[92]
Splendid case. The root exerted more force then when pressing through the hole in the tied stick, because greater length of radicle nearly .6 of inch acted, & the mean diameter root, ie of Hole was
No 1 1500 gramms= 52.9 oz
No 2 600 gramms = 21.2 oz
no. 2 acted much less than no 1. because root freed itself laterally through hole & became much flattened & expended its force in growing in this shape, instead of cylindrical
[93]
Diameter of Roots of Bean about middle
No 1 which had passed through the hole in wooden pincers
4. 20 mm x 3. 45 5 mm = .165 inch x .134 7 inch
No 2
3.6 mm x 3.0 mm = .142 inch x 118 inch
No 2 was one with many rootlets escaping on one side & seemed to eye most flatten
[calculations not transcribed]
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 26 July, 2023