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Letter 11628

Darwin, Francis to Darwin, C. R.

24 July 1878

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    Notes Julius Sachs's opinion on the heliotropism of moulds: he can see no use in the response.

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    C. E. Stahl is working on swarm spores which can be made both helio- and apheliotropic.

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    Sachs has told him that some ferns sleep, and he suspects that some grasses may move.

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    Sachs also feels they may be working at bloom from a wrong point of view and suggests leaves may need to keep dry in order to keep their stomata open.

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