From J. D. Hooker [c. 25 March 1854]
Summary
JDH summarises letter from Humboldt.
JDH answers CD’s questions on glacial action in Himalayas.
| Author: | Joseph Dalton Hooker |
| Addressee: | Charles Robert Darwin |
| Date: | [c. 25 Mar 1854] |
| Classmark: | DAR 205.9: 382 |
| Letter no: | DCP-LETT-1559 |
To J. D. Hooker 15 November [1854]
Summary
Calculating small number of species in aberrant genera of insects and plants.
Joachim Barrande’s "Colonies", Élie de Beaumont’s "lines of Elevation", Forbes’s "Polarity" make CD despair, as these theories lead to conclusions opposite to CD’s from the same classes of facts.
| Author: | Charles Robert Darwin |
| Addressee: | Joseph Dalton Hooker |
| Date: | 15 Nov [1854] |
| Classmark: | DAR 114: 156 |
| Letter no: | DCP-LETT-1601 |
From J. D. Hooker 25 August 1854
Summary
JDH and F. W. Binney identify Calamites specimens as pith casts. They are cryptogams related to, but higher than, Lycopodiaceae and contradict progression.
Insects found in coal.
Lyell says Stonesfield slate marsupials are actually placentals.
JDH reading Alexander Braun on individuality ["Das Individuum der Pflanze in seinem Verhältniss zur Species", Abh. K. Akad. Wiss. Berlin (Phys. Kl.) (1853): 19–122].
| Author: | Joseph Dalton Hooker |
| Addressee: | Charles Robert Darwin |
| Date: | 25 Aug 1854 |
| Classmark: | DAR 205.9: 384 |
| Letter no: | DCP-LETT-1581 |
| letter | (3) |
| Hooker, J. D. | (2) |
| Darwin, C. R. | (1) |
| Darwin, C. R. | (2) |
| Hooker, J. D. | (1) |
| Darwin, C. R. | (3) |
| Hooker, J. D. | (3) |
