RECORD: Darwin, C. R. 1866.12. Ipomœa purpurea / Second Generation. CUL-DAR77.94-95. (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).

[94]

Ipomœa purpurea. Dec. 1866 Second Generation

Taller plants derived from cross fertilisation

Again crossed by distinct plants in same pot & castrated after being fertilised

Double white Thread Stigma covered with pollen

Single White Thread Pollen on one edge alone of stigma

Spontaneously self-fertilised

6. 5. 4 5 5 6. 6 6 6 5 6 5 6 4 6 3 4 5 5 6 [=] 104 6. 5 5 5 3 6 6 6 6 6 6 6 [=] 170

5. 6. 5. 6. 6. 6. 5 5 4 6. 5 5 6 6 6 5 4 6 4 5 6 [=] 112 6 5 6 6 5 3 4 5 1 (excluded) 6 6 6 [=] 171 [-] 1 excluded [=] 170

6. 5 6 5 3 6 5 4 6 3 6 6 5 5 6 4 4 6 5 4 5 [=] 105 6 1 5 6 3 4 6 5 6 5 4 4 4 5 2 3 4 3 3 4 2 [=] 190 3 3 4 5 3 6 3 4 5 5 4 4 5 5 [=] 249

(32) set

33, but one to be excluded (21 21 14 [=] 56 self)

 

average 5.312

—average 5.312

average 4.446

(33 were fertilised)

The self- & spont, fert flower were last

 

 

[94v]

Give total pods produced by crossed & self-fertilise fr Down A

[95]

Ipomœa purp— Second Generation

Shorter Plants derived from short self-fertilised Plants

Again fertilised with pollen from same flower & castrated

Double Black Thread Stigma covered with pollen

Single Black Thread pollen on one edge alone

Spont. self-fertilised

3 6 2 5 5 5 6 6 1 6 6 5 6 4 4 5 6 3 1 [=] 85 6 4 4 6 6 3 3 4 1 1 [=] 123 [-] 4 to omitted [=] 119 by 25

6. 4. 5 5 6 6 6 3 5 4 5 6 6 4 4 4 5 3 6 [=] 93 6. 6 4 4 6 4 5 3 5 6 6 [=] 148

1. 5 3 2 6 2 5 6 6 4 5 2 4 5 5 4 5 5 3 1 [=] 79 5 6 6 6 3 [=] 105

set (29

set (30

(25

(31 fertilised)

(31 fertilised)

 

—(4.241) —4.160

average 4.933

4.200

 

 

Lessened fertility due to starving from greater vigour of crossed

Plants ?

 

 

 

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

File last updated 24 December, 2025