RECORD: Darwin, C. R. 1879.05.04. Phaseolus long radicles with half in water, perpendicularly down. CUL-DAR209.6.14. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2022. 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 volume CUL-DAR209.6 contains materials for Darwin's book Movement in plants (1880).
Notes for Movement in plants. Text F1325.
[14]
May 4th 1879 8º 15' Phaseolus long radicles with half in water, perpendicularly down.
7 touched with Caustic & 7 without any
These beans had germinated being stuck perpendicularly in it in sawdust & their radicles had grown perpendicularly down parallel to one edge of the bean, but now (May 5th 8th 7º 45' a.m) they have all without exception in their basal parts have diverged from the bean, & therefore Sachs' curvature give a diametrically opposite movement in this case comparative to that of common bean. After this divergence of the basal & therefore whole radicle, the tips of most of those which had not been cauterised, had grown vertically downwards, whereas those with minute black tips had not so grown. — The points of position of the petioles of Coty: with hypocotyl are different in Bean & Phaseolus, & in each case the side of radicle, which one wd have thought wd have been best supplied with nutriment & wd consequently wd have grown quickest & caused curvature seems the less well supplied.—
These observations on Phaseolus, show at least that a movement, viz Sachs curvature is not in the least interfered with by caustic on tip.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 16 January, 2023