From John Ball 8 August 1879
Summary
Hopes CD will read and comment on his lecture ["Origin of flora of the Alps", Proc. R. Geogr. Soc. (1879)]. Disgrees with CD; JB maintains that the high antiquity of existing plant genera and families explains wide differences in their distribution.
| Author: | John Ball |
| Addressee: | Charles Robert Darwin |
| Date: | 8 Aug 1879 |
| Classmark: | DAR 160: 35 |
| Letter no: | DCP-LETT-12187 |
From John Ball 28 November 1879
Summary
Thanks CD for noticing some difficulties in his hypothesis. Concedes that there is no proof that higher plants are more intolerant of carbon dioxide than lower plants. Argues that the main difference between the lowlands and the high mountains in Palaeozoic times would be the much greater climatic fluctuations that would occur on the mountains. Discusses carbon dioxide diffusion in the Palaeozoic atmosphere. Thinks that the large number of species and genera peculiar to high mountains favours the assumption that "their diffusion must date from a geologically remote period" [see ML 2: 20–2].
| Author: | John Ball |
| Addressee: | Charles Robert Darwin |
| Date: | 28 Nov 1879 |
| Classmark: | DAR 160: 36 |
| Letter no: | DCP-LETT-12335 |
