From:
Charles Robert Darwin
To:
Francis Darwin
Date:
15 [July 1878]
Source of text:
DAR 211: 24
Summary:
A report has arrived for FD which CD will forward.
Contributor:
Darwin Correspondence Project
From:
Francis Darwin
To:
Charles Robert Darwin
Date:
[before 17 July 1878]
Source of text:
DAR 209.1: 155; DAR 274.1: 50, 52
Summary:
More sleepers from green-house.
Julius Sachs’s view of climbing plants: he distinguishes between nutation to find a support and growth after support is found.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
17 July [1878]
Source of text:
DAR 211: 37
Summary:
Discusses sleep movements of Porlieria.
Has read an abstract of Julius Wiesner on heliotropism and geotropism ["Die heliotropischen Erscheinungen im Pflanzenreiche", Anz. Kais. Akad. Wiss. Wien 15 (1878): 137–40] which seems important but is puzzling.
Gives details of his observations on climbing plants with reference to comments by Julius Sachs.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
20 [July 1878]
Source of text:
DAR 211: 38
Summary:
Has offered Carl Semper the writing machine.
Speculates on the mechanism of movement in plants and their reception of and response to stimuli.
Contributor:
Darwin Correspondence Project
From:
Francis Darwin
To:
Charles Robert Darwin
Date:
[21 July 1878]
Source of text:
DAR 162: 59, DAR 209.8: 151
Summary:
Has been investigating nutational movements of climbing plants; comments on the opinions of Julius von Wiesner and Julius Sachs. Remarks on the sleep movements of certain plants and the mechanism of tendril curvature. Is experimenting with Porlieria.
Has visited K. G. Semper’s laboratory.
Contributor:
Darwin Correspondence Project
From:
Francis Darwin
To:
Charles Robert Darwin
Date:
24 and 25 July 1878
Source of text:
DAR 162: 60, DAR 209.6: 198
Summary:
Notes Julius Sachs’s opinion on the heliotropism of moulds: he can see no use in the response.
C. E. Stahl is working on swarm spores which can be made both helio- and apheliotropic.
Sachs has told him that some ferns sleep, and he suspects that some grasses may move.
Sachs also feels they may be working at bloom from a wrong point of view and suggests leaves may need to keep dry in order to keep their stomata open.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
25 July [1878]
Source of text:
DAR 211: 40
Summary:
Is forwarding the writing machine to Carl Semper.
Is glad FD has taken up his old friends, the twiners.
Hopes to get heliotropic aerial roots from J. D. Hooker. Asks FD to find out whether any moulds or roots are apheliotropic. Is puzzled by heliotropism in subterranean roots.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
30 July [1878]
Source of text:
DAR 211: 41
Summary:
Comments on function of bloom.
Describes the effect of water shortage on sleep movements in Porlieria.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
[1 Aug 1878]
Source of text:
DAR 211: 52
Summary:
Describes observations and experiments on the response to light of Bignonia capreolata tendrils.
Contributor:
Darwin Correspondence Project
From:
Francis Darwin
To:
Charles Robert Darwin
Date:
[before 3 Aug 1878]
Source of text:
DAR 209.8: 152
Summary:
Sachs jumps to the conclusion twiners and tendrils are similar from the Menispermum that twined without a stick. Akebia grows down a stick; not only the free end is involved.
Sleeping plants.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
3 Aug [1878]
Source of text:
DAR 211: 42
Summary:
Is pleased FD’s climbing work goes well.
Thanks him for information on heliotropism.
Discusses sleep movements
and his observations on the sensitivity of radicle tips.
Contributor:
Darwin Correspondence Project
From:
Francis Darwin
To:
Charles Robert Darwin
Date:
[4–7 Aug 1878]
Source of text:
DAR 162: 57
Summary:
Experiments on effects of removing "bloom" from leaves and fruit.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
14 [Aug 1878]
Source of text:
DAR 211: 43
Summary:
Instructs FD to plant some Oxalis seeds.
Wishes to trace the movement of an old cotyledon. Asks him to examine and compare the pulvinus of a species which moves its cotyledon greatly with one of a species that moves it only moderately.
Are the tendrils ready for heliotropic experiment yet?
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
[17 Aug 1878]
Source of text:
DAR 211: 44
Summary:
Instructions to sow some seeds
and suggestions for experiment on effects of removal of bloom.
Likes Hugo de Vries very much; has hardly ever seen so modest a man.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
[19 Aug 1878]
Source of text:
DAR 271.2: 4v
Summary:
Asks FD to reply to a letter [11653a] requesting a list of CD’s books.
Contributor:
Darwin Correspondence Project
From:
Francis Darwin
To:
Charles Robert Darwin
Date:
[12 Sept 1878]
Source of text:
DAR 274.1: 44
Summary:
He has been working hard at Kew for two days.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
12 Sept [1878]
Source of text:
DAR 211: 45
Summary:
Julius von Sachs’s views on stomata seem largely correct, but CD cannot understand how leaves can survive submerged for such long periods.
Has been observing Drosera and concludes that none of the movement of the tentacles is caused by growth.
Suggests observations to show role of pulvinus in leaf movement.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
13 [Sept 1878]
Source of text:
DAR 211: 46
Summary:
Asks what position the sub-peduncles assume when the main flower peduncle of Oxalis is tied so as to be horizontal.
Asks whether FD can find some plants at Kew for CD to trace epinastic and hyponastic movements.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Francis Darwin
Date:
[21 Nov 1878]
Source of text:
DAR 211: 47
Summary:
Instructs FD to make some observations on movement in Trifolium and Impatiens. Sends some seeds to be sown.
Contributor:
Darwin Correspondence Project
From:
Francis Darwin
To:
Charles Robert Darwin
Date:
[before 22 Nov 1878]
Source of text:
DAR 274.1: 42
Summary:
Horse chestnut roots have not acted at all well.
Contributor:
Darwin Correspondence Project