To Asa Gray 15 January 1872
Summary
Questions AG on earthworm activity in North America and would welcome information from northern Canada if AG has a correspondent there.
| Author: | Charles Robert Darwin |
| Addressee: | Asa Gray |
| Date: | 15 Jan 1872 |
| Classmark: | Archives of the Gray Herbarium, Harvard University (99) |
| Letter no: | DCP-LETT-8158 |
To Asa Gray 8 July [1872]
Summary
Thanks for AG’s book, How plants behave [see 8363].
Is correcting proofs of Expression.
| Author: | Charles Robert Darwin |
| Addressee: | Asa Gray |
| Date: | 8 July [1872] |
| Classmark: | Archives of the Gray Herbarium of Harvard University (107) |
| Letter no: | DCP-LETT-8402 |
To Asa Gray 22 October 1872
Summary
Spiralling of tendrils.
Has worked hard on Drosera.
Is interested in tracing the "nerves" of Dionaea which follow the vascular bundles. Finds he can paralyse half of the leaf by pricking it at a certain point.
Wishes AG to carry out two experiments on D. filiformis.
Has received AG’s Dubuque address [Am. J. Sci. 3d ser. 4 (1872): 282–98].
| Author: | Charles Robert Darwin |
| Addressee: | Asa Gray |
| Date: | 22 Oct 1872 |
| Classmark: | Gray Herbarium of Harvard University (100) |
| Letter no: | DCP-LETT-8568 |
