Discusses heliotropism in plant cotyledons. Asks for information.
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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
Discusses heliotropism in plant cotyledons. Asks for information.
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.
Thanks for letter.
Comments on growth and movement of plants.
Force of turgor is true cause of movement in plants. HdeV hopes to identify the substance which increases the cell’s water-absorbing power.
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.
Movement of tentacles of Drosera.