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From Hugo de Vries   7 November 1875

Summary

Thanks for 2d edition of Climbing plants and for CD’s recognition of HdeV’s two essays on the subject [Climbing plants, pp. v–vi, 9 n., 22, 160]. Cause of spiral growth of tendrils.

Author:  Hugo de Vries
Addressee:  Charles Robert Darwin
Date:  7 Nov 1875
Classmark:  DAR 180: 19
Letter no:  DCP-LETT-10248

From Hugo de Vries   17 November 1875

Summary

Hopes to continue study of climbing plants next summer and to observe facts mentioned in CD’s letter.

Author:  Hugo de Vries
Addressee:  Charles Robert Darwin
Date:  17 Nov 1875
Classmark:  DAR 180: 20
Letter no:  DCP-LETT-10264

From Hugo de Vries   17 August 1878

Summary

Contraction of plant roots.

Author:  Hugo de Vries
Addressee:  Charles Robert Darwin
Date:  17 Aug 1878
Classmark:  DAR 180: 21
Letter no:  DCP-LETT-11665

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

From Hugo de Vries   8 December 1880

Summary

Many thanks for Movement in plants; is especially interested in sensitivity of young seedlings.

Author:  Hugo de Vries
Addressee:  Charles Robert Darwin
Date:  8 Dec 1880
Classmark:  DAR 180: 25
Letter no:  DCP-LETT-12897

From Hugo de Vries   15 October 1881

Summary

Thanks for Earthworms.

HdeV is studying the causes of variation in plants and is very interested in Pangenesis.

Author:  Hugo de Vries
Addressee:  Charles Robert Darwin
Date:  15 Oct 1881
Classmark:  DAR 180: 26
Letter no:  DCP-LETT-13402
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letter (9)
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Vries, Hugo de[X]
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1878 (1)
1879 (4)
1880 (1)
1881 (1)
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