To Francis Darwin 15 [July 1878]
Summary
A report has arrived for FD which CD will forward.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 15 [July 1878] |
| Classmark: | DAR 211: 24 |
| Letter no: | DCP-LETT-11511 |
To Francis Darwin [before 17 July 1878]
Summary
Thanks for list of sleepers.
Thinks it would be a good idea to give writing machine to Carl Semper.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | [July 1878] |
| Classmark: | DAR 211: 36 |
| Letter no: | DCP-LETT-11579 |
To Francis Darwin 2 July [1878]
Summary
Suggests FD call on Carl Semper.
Inquires about Porlieria: Do the leaves shut to check evaporation? Does it appear silver under water?
Explains how he thinks the pulvinus acts; wishes FD would investigate the point.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 2 July [1878] |
| Classmark: | DAR 211: 32 |
| Letter no: | DCP-LETT-11586 |
To Francis Darwin 6 [July 1878]
Summary
Has a magnificent bush of Porlieria. There is no vestige of bloom; CD will test for sleep movements. Reports successful experiments on temperature-induced sensitivity of radicles.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 6 [July 1878] |
| Classmark: | DAR 211: 33 |
| Letter no: | DCP-LETT-11593 |
To Francis Darwin 7 [July 1878]
Summary
Describes sleep movements in Porlieria and his experiments on movements of radicles.
Thalia flowers have interesting mechanism to ensure cross-fertilisation.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 7 [July 1878] |
| Classmark: | DAR 211: 34 |
| Letter no: | DCP-LETT-11595 |
To Francis Darwin 14 July [1878]
Summary
Asks for list of families of sleeping plants. Believes sleep is merely modified circumnutation at a particular time of day.
Porlieria has had no water for some time but shows no sign of flagging.
Describes the response of Thalia flowers to touch.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 14 July [1878] |
| Classmark: | DAR 211: 35, 36, 39 |
| Letter no: | DCP-LETT-11608 |
To Francis Darwin 17 July [1878]
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.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 17 July [1878] |
| Classmark: | DAR 211: 37 |
| Letter no: | DCP-LETT-11615 |
To Francis Darwin 20 [July 1878]
Summary
Has offered Carl Semper the writing machine.
Speculates on the mechanism of movement in plants and their reception of and response to stimuli.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 20 [July 1878] |
| Classmark: | DAR 211: 38 |
| Letter no: | DCP-LETT-11620 |
To Francis Darwin [20? July 1878]
Summary
Horace Darwin suggests FD water the Porlieria copiously to see whether it will keep awake all day.
[Possibly P.S. to 11620.]
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | [20? July 1878] |
| Classmark: | DAR 211: 39 |
| Letter no: | DCP-LETT-11621 |
To Francis Darwin 25 July [1878]
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.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 25 July [1878] |
| Classmark: | DAR 211: 40 |
| Letter no: | DCP-LETT-11631 |
To Francis Darwin 30 July [1878]
Summary
Comments on function of bloom.
Describes the effect of water shortage on sleep movements in Porlieria.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | 30 July [1878] |
| Classmark: | DAR 211: 41 |
| Letter no: | DCP-LETT-11635 |
