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To Hugo de Vries   13 February 1879

Summary

Discusses heliotropism in plant cotyledons. Asks for information.

Author:  Charles Robert Darwin
Addressee:  Hugo de Vries
Date:  13 Feb 1879
Classmark:  Artis Library (De Vries 5)
Letter no:  DCP-LETT-11881

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

To Hugo de Vries   12 August 1879

Summary

Thanks for letter.

Comments on growth and movement of plants.

Author:  Charles Robert Darwin
Addressee:  Hugo de Vries
Date:  12 Aug 1879
Classmark:  Artis Library (De Vries 6)
Letter no:  DCP-LETT-12190

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

To Hugo de Vries   6 September 1879

Summary

Perhaps movement from side to side in plants is caused by the contraction of one side, rather than the expansion of the other.

Sends seeds of Lychnis Githago: he observed the hypocotyledenous stem, not the root, contracting.

Author:  Charles Robert Darwin
Addressee:  Hugo de Vries
Date:  6 Sept 1879
Classmark:  Artis Library (De Vries 7)
Letter no:  DCP-LETT-12219F

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
Document type
letter (7)
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Correspondent
Date
1879
02 (2)
08 (2)
09 (3)
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