Suggests that, if HdV make further observations on tendrils, he attend to Echinocystis, as described on p. 132 of Climbing plants.
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Suggests that, if HdV make further observations on tendrils, he attend to Echinocystis, as described on p. 132 of Climbing plants.
Arranges for HdeV to call.
Regrets he cannot receive HdeV at Down, because he has just left home.
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.
Discusses heliotropism in plant cotyledons. Asks for information.
Thanks for letter.
Comments on growth and movement of plants.
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.
Thanks for copies of HdV’s two articles on climbing plants (Vries 1873a and 1873b).
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.
Hopes to continue study of climbing plants next summer and to observe facts mentioned in CD’s letter.
Contraction of plant roots.
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.
Experiments to determine mechanism of tendril curvature; importance of variations in cell turgidity. Contraction in roots caused by increased turgor.
Force of turgor is true cause of movement in plants. HdeV hopes to identify the substance which increases the cell’s water-absorbing power.
Movement of tentacles of Drosera.