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Vries, Hugo de in correspondent 
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From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
19 Feb 1874
Source of text:
Artis Library (De Vries 1)
Summary:

Thanks for copies of HdV’s two articles on climbing plants (Vries 1873a and 1873b).

Contributor:
Darwin Correspondence Project
From:
Hugo de Vries
To:
Charles Robert Darwin
Date:
7 Nov 1875
Source of text:
DAR 180: 19
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.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
10 Nov 1875
Source of text:
Artis Library (De Vries 2)
Summary:

Suggests that, if HdV make further observations on tendrils, he attend to Echinocystis, as described on p. 132 of Climbing plants.

Contributor:
Darwin Correspondence Project
From:
Hugo de Vries
To:
Charles Robert Darwin
Date:
17 Nov 1875
Source of text:
DAR 180: 20
Summary:

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

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
8 Aug [1878]
Source of text:
Artis Library (De Vries 3)
Summary:

Regrets he cannot receive HdeV at Down, because he has just left home.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
[10 or 11 Aug 1878]
Source of text:
Artis Library (De Vries 4a)
Summary:

Arranges for HdeV to call.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
[15] Aug [1878]
Source of text:
Artis Library (De Vries 4b)
Summary:

Enjoyed seeing HdeV yesterday.

Following the point mentioned by HdeV, CD has observed the difference in corrugation of primary roots in plants exposed to dry and damp soil.

Contributor:
Darwin Correspondence Project
From:
Hugo de Vries
To:
Charles Robert Darwin
Date:
17 Aug 1878
Source of text:
DAR 180: 21
Summary:

Contraction of plant roots.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
13 Feb 1879
Source of text:
Artis Library (De Vries 5)
Summary:

Discusses heliotropism in plant cotyledons. Asks for information.

Contributor:
Darwin Correspondence Project
From:
Hugo de Vries
To:
Charles Robert Darwin
Date:
24 Feb 1879
Source of text:
DAR 209.3: 336
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.

Contributor:
Darwin Correspondence Project
From:
Hugo de Vries
To:
Charles Robert Darwin
Date:
7 Aug 1879
Source of text:
DAR 180: 22
Summary:

Experiments to determine mechanism of tendril curvature; importance of variations in cell turgidity. Contraction in roots caused by increased turgor.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
12 Aug 1879
Source of text:
Artis Library (De Vries 6)
Summary:

Thanks for letter.

Comments on growth and movement of plants.

Contributor:
Darwin Correspondence Project
From:
Hugo de Vries
To:
Charles Robert Darwin
Date:
2 Sept 1879
Source of text:
DAR 180: 23
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.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Hugo de Vries
Date:
6 Sept 1879
Source of text:
Artis Library (De Vries 7)
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.

Contributor:
Darwin Correspondence Project
From:
Hugo de Vries
To:
Charles Robert Darwin
Date:
10 Sept 1879
Source of text:
DAR 180: 24
Summary:

Movement of tentacles of Drosera.

Contributor:
Darwin Correspondence Project