RECORD: Darwin, C. R. [1878].07.02-04. Trifolium subterraneum / Draft of Cross and self fertilisation. CUL-DAR209.1.153. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 6.2022. 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-DAR209.1 contains materials on circumnutation of leaves and sleep for Darwin's book Movement in plants (1880).


[153]

Trifolium subterraneum

July 2d 6° 40' am 8° a. Temp 18°C.

9° to right & little up

10 up & to right

11° little down

12' to left & back parallel

1° down

2' do

3° risen & to right

4° far to right

4 55 so far to right mere guess

6 beyond limit of glass

3° 8° 15 new dot

9° up & to left Terminal Leaflet

10. 3 enormously up & to right

11. 5 to right

12 great down & to right

1° up & to right

2° enormously up & to right

3. 7 to right & up

4° 3 immensely down

5. 15 enormously up going to sleep

6 12 vertical

(of no use too much magnified)

4th moved Pot [sketch] 6° 45'

[153v]

kinds of pollen [excised]

That insects should [excised]

species as long as they [excised]

portance of distinct [excised]

ilsation of distinct [excised]

ruphon that insects act [excised]

of the plant. The cause [excised]

through habit to work thus thus enabled [excised]

just learnt how to [excised]

flower, and how far [excised]

their proboscides. They [excised]

would does an artificer [excised]

engines, and who would [excised]

=secutively each wheel [excised]

or at least bees, seem [excised]

all their manifold operations; a [excised]

thus holds good in [excised]

through the corolla, [excised]

an illegitimate man [excised]

[Cross and self fertilisation, p. 419: "A large number of the stigmas of a plant of Thyme, in which the anthers were completely aborted, were examined; and these stigmas, though scarcely larger than a split needle, were covered not only with pollen of Thyme brought from other plants by the bees, but with several other kinds of pollen.
That insects should visit the flowers of the same species as long as they can, is of great importance to the plant, as it favours the cross-fertilisation of distinct individuals of the same species; but no one will suppose that insects act in this manner for the good of the plant. The cause probably lies in insects being thus enabled to work quicker; they have just learnt how to stand in the best position on the flower, and how far and in what direction to insert their proboscides.† They act on the same principle as does an artificer who has to make half-a-dozen engines, and who saves time by making consecutively each wheel and part for all of them. Insects, or at least bees, seem much influenced by habit in all their manifold operations; and
† Since these remarks were written, I find that H. Müller has come to almost exactly the same conclusion with respect to the cause of insects frequenting as long as they can the flowers of the same species: 'Bienen Zeitung' July 1876 page 182.
we shall presently see that this holds good in their felonious practice of biting holes through the corolla."]


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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