RECORD: Darwin, C. R. 1879.04.29. Pharbitis nil. CUL-DAR209.7.57. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. 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 volumes CUL-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).


[57]

April 29th 1879

Ipo Pharbitis nil (before N.E. wind all other sides darkened.) (Bright sky)

45 [-] 23 [=] 22

6°. 57'

8° 3'

8.37

10.10

11.53

12.23 opposite 1/2 ⨀ = 5°- 26' to the light

1° 53

2.45 ⨀ completed = 2°. 22' from the light

3 58

4 28

4.45

7° semicircle to light

8 55'

9.35'

10. 10 little pot semicircle— say 10° semicircle from light— (but now dark) — 2d circle

(I do not think of any use)

Summary

Half circle to light (from 6° 57 a.m to 12° 23 P.m) took 5°. 26.

─ from light (from 12° 23' to 2° 45' P.m) took 2°. 22' / 3.° 04

Therefore moved twice as quick slow to light than from light to dark

Half-circle to light (from 2° 45' 7° P.m) took 4°15'

─ from light (from 7° to about 10° P.m) (but then this was all in dark) took 3° / 1. 15

Therefore moved slower to dim afternoon light than from light when it was dark.

[57v]

296

Ch VII

the male, & the long-styled [illeg] the female. It is however a more simple view that in the case of Euonymus sufficient time has not elapsed for the reduction of the pistil of an ordinary in the male & hermaphrodite plant, seeing that most of them still yield some fruit. But flower of an Euonymus; though this view does not account for the pistils in the polleniferous flowers being sometimes proceeding in length that longer than they are in the female flowers.)

[in margin:] Beech

(Fragaria vesca, Virginiana, Chiloensis &c (Rosaceæ)

A tendency to the separation of the sexes in the cultivated strawberry in seems to be much more strongly marked & has been more alluded to in the U. States than in Europe; & this fact is interesting as showing the direct effect of the conditions of life action of climate on the reproductive organs. In the best account which I have seen * (*Mr. Leonard Wray in Gard: Chron: 1861 p 716) D it is stated that many of the varieties there in the U. States consist of three forms, namely females, which produce a heavy crop of fruit, ─ of hermaphrodites, which "seldom produce other than a very scanty crop of inferior

[Forms of flowers, pp. 292-3: "A conversion of this kind is at least possible, although it is the reverse of that which appears actually to have occurred with some Rubiaceous genera and Ægiphila; for with these plants the short-styled form has become the male, and the long-styled the female. It is, however, a more simple view that sufficient time has not elapsed for the reduction of the pistil in the male and hermaphrodite flowers of our Euonymus; though this view does not account for the pistils in the polleniferous flowers being sometimes longer than those in the female flowers.
Fragaria vesca, Virginiana, Chiloensis, &c. (Rosaceæ).—A tendency to the separation of the sexes in the cultivated strawberry seems to be much more strongly marked in the United States than in Europe; and this appears to be the result of the direct action of climate on the reproductive organs. In the best account which I have seen,* it is stated that many of the varieties in the United States consist of three forms, namely, females, which produce a heavy crop of fruit,—of hermaphrodites, which "seldom produce other than a very scanty crop of inferior and imperfect berries,"—and of males, which produce none."]


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

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