RECORD: Darwin, C. R. 1866. Ipomoea purpurea - measurements in inches & decimals. CUL-DAR78.70-71. (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 volume CUL-DAR78 contains notes on experiments for Darwin's book Cross and self fertilisation.
[70]
Ipomoea purpurea - measurements in inches & decimals.
If I do 8 oz/br it will not be 1/10' of inch for
|
Crossed |
Self |
1' gen. |
51600 |
39400 |
2d gen |
50500 |
39800 |
3d gen |
46450 |
31700 |
|
48850 |
42100 |
4 gen |
49525 |
37400 |
|
52500 |
37900 |
5' |
75550 |
61425 |
|
90825 |
77325 |
6 |
113950 |
89700 |
|
46850 |
25200 |
[÷] 72 |
626600 |
481950 |
[71]
Ipomoea purpurea 1866
Crossed with other plant White Th. |
Fert. with pollen of own fl. Black |
|
Th. |
Spont. self-fertilised |
|
5 [+] 6 [+] 3 [+] 3 [+] 5 [+] 6 [+] 6 [+] 5 [+] 5 [+] 6 |
3. [+] 6. [+] 6 [+] 4 [+] 6 [+] (1) omit [+] 6 [+] 6 [+] 6 |
6. [+] 6. [+] 6. [+] 6 [+] 5 [+] 6 [+] 6 [+] 5 [+] 6 [+] 8 |
[=] 50 average 5.0 |
43 [÷] 8 [=] 5.37 average |
60[÷] 10 [=] average 6.0 |
— not selected taken as ripe much pollen used—
43 43 of these seed equalled in weight 39 of seeds marked by Black Thread, or fert. with own pollen
And 50 white thread, or I crossed seed equally 49 1/2 seed spontaneously self-fertilise
So that seeds fert with pollen of same flowers Heavier!!!
can the vars be a little sterile with each other??
too much pollen?
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 26 December, 2025