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From G. H. Darwin   10 October 1878

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Summary

Recounts the experiments on Fechner’s law he has found in Helmholz; they are on the smallest perceptible differences of illumination. Describes how to test whether plants’ responses to lights are in accordance with it.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  10 Oct 1878
Classmark:  DAR 210.2: 70
Letter no:  DCP-LETT-11722

To G. H. Darwin   29 October [1878]

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Summary

Rejoices that he should have "staggered" William Thomson so quickly and that the latter should speak of GHD’s "discovery". The internal heat [of the earth] will please geologists and evolutionists.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  29 Oct [1878]
Classmark:  DAR 210.1: 74
Letter no:  DCP-LETT-11729
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letter (2)
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