From G. H. Darwin 10 October 1878
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]
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 |
Document type
| letter | (2) |
Author
| Darwin, C. R. | (1) |
| Darwin, G. H. | (1) |
Addressee
| Darwin, C. R. | (1) |
| Darwin, G. H. | (1) |
Correspondent
| Darwin, C. R. | (2) |
| Darwin, G. H. | (2) |
