RECORD: Darwin, C. R. 1864.05.00-1864.06.13 Antirrhinum Peloric. CUL-DAR51.B20-B21. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2022. 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.


[B20]

Antirrhinum Peloric var. Wonder. (May 64

Black thread by own pollenĀ 

White thread by pollen of common red Snap-dragon

267 [illeg] of seed

332 finest pod 157

I weighed seed from 3 finest pods = 1.04 gr.

3 finest pods 0.92 gr

from 6 finest pods including above = 1.83 gr The half of this is 0.915, so same weight as pods fertilised by common snap-dragon.

6 flowers were thus fertilised & all produced capsules, but 3 of them were poor so that 1/2 well set.

13 flowers were fertilised 8 produced capsules, of which one was poor, so 7/13 set well, rather above half

 

 

[B20v]

One pod alone set without aid & under net & this produced few very poor seed.

This is a remarkable contrast to common snap dragon, of which the 2 lower anthers touch the stigma, & they self seed. After net removed the peloric set some pods. I suppose owing to visits of insects, & a seedling has come up in a pot. It is singular that the capsules of the peloric do not open by 3 sinuous doors like those of Common snap-d

[B21]

Judging by eye the capsules of common snap-d- naturally & artificially fertilized produced the same number of seed as when fertilized by Peloric. All or nearly all the flowers fertilized by Peloric pollen set capsules

Seed put in watch-glasses & carefully compared.

June 13' 64. The seedlings are coming up, a multitude from common Snap-d by pollen of peloric - & conversely from peloric by pollen, of common snap-d. But the seedlings from peloric by own pollen (not one flower) are all only about 1/3 of size of the seedlings from above other two crosses!!


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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 25 September, 2022