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From Hugo de Vries 24 February 1879
Summary
Did not wish to imply that some leaves are insensitive to light, only that he could not measure their sensitivity. Contraction of roots seems common.
| Author: | Hugo de Vries |
| Addressee: | Charles Robert Darwin |
| Date: | 24 Feb 1879 |
| Classmark: | DAR 209.3: 336 |
| Letter no: | DCP-LETT-11900 |
From Hugo de Vries 7 August 1879
Summary
Experiments to determine mechanism of tendril curvature; importance of variations in cell turgidity. Contraction in roots caused by increased turgor.
| Author: | Hugo de Vries |
| Addressee: | Charles Robert Darwin |
| Date: | 7 Aug 1879 |
| Classmark: | DAR 180: 22 |
| Letter no: | DCP-LETT-12186 |
From Hugo de Vries 2 September 1879
Summary
Force of turgor is true cause of movement in plants. HdeV hopes to identify the substance which increases the cell’s water-absorbing power.
| Author: | Hugo de Vries |
| Addressee: | Charles Robert Darwin |
| Date: | 2 Sept 1879 |
| Classmark: | DAR 180: 23 |
| Letter no: | DCP-LETT-12213 |
From Hugo de Vries 10 September 1879
Summary
Movement of tentacles of Drosera.
| Author: | Hugo de Vries |
| Addressee: | Charles Robert Darwin |
| Date: | 10 Sept 1879 |
| Classmark: | DAR 180: 24 |
| Letter no: | DCP-LETT-12223 |
