RECORD: Darwin, C. R. [1875-1876]. Ipomœa purpurea scale 1/40 of inch to inch Both diagrams - this is best / Draft of Cross and self fertilisation, p. 53 diagram. CUL-DAR77.59-60. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and John van Wyhe, edited by John van Wyhe 2.2023. RN2
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-DAR 76-79 contain material for Darwin's book Cross and self fertilisation (1876).
[59]
Ipomœa purpurea, scale 1/40' of inch to 1 inch— Both Diagrams— this is best — But omit the right Hand general average one— Put the self to right hand — rather further apart — & each generation further apart— Put same foot-note to 8th gen— to explain tallness. — Give as Heading—statement that the average crossed height of crossed plants the left of each pair of lines.—
1st. 2nd. 3rd. 4th. 5th. 6th. 7th. 8th. 9th. 10th.
Average Generations.
Scale 1/40.
difference of all 10 generation
[diagram] Name of Pl
These are absolute heights ratios cd be much better one thin line for crossed
[Draft of "Diagram showing the mean heights of the crossed and self-fertilised plants of Ipomoea purpurea in the ten generations", for Cross and self fertilisation, p. 53.]
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Crossed Plants Crossed
Self Fert. Plants. Self Fert. } Average height of Plants.
Generations. 1st. 2nd. 3rd. 4th. 5th. 6th. 7th. 8th. 9th. 10th.
Average Generations.
Scale 1/40.
[Annotated diagram of heights of 10 generations of crossed and self-fertilised plants.]
[60bv]
(of no use)
(Ipomœa)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 30 January, 2026