From S. P. Woodward 2 May 1856
Summary
Proportion of molluscan species to genera in various periods. The difficulty of determining species increases with the number of species per genus. Identifying species within a genus is most difficult in that period in which the genus shows its greatest development.
| Author: | Samuel Pickworth Woodward |
| Addressee: | Charles Robert Darwin |
| Date: | 2 May 1856 |
| Classmark: | DAR 181: 153 |
| Letter no: | DCP-LETT-1864 |
To S. P. Woodward 15 May [1856]
Summary
Thanks for Supplement to SPW’s Manual of the Mollusca [1851–6]. Praises SPW’s work. "What an amount of labour is condensed in your little volume! … I fully believe & hope that you will reap the only reward worth having, the consciousness that you have done good service to the cause of Science."
| Author: | Charles Robert Darwin |
| Addressee: | Samuel Pickworth Woodward |
| Date: | 15 May [1856] |
| Classmark: | Sotheby’s (dealers) (21 March 1966) |
| Letter no: | DCP-LETT-1875 |
To S. P. Woodward 27 May [1856]
Summary
Thanks for answer to query. "I see … that there is no hope of comparing the same genus at two different periods, and seeing whether the tendency to vary is greater at one period in such genus than at another period."
Inclined to dispute SPW’s doctrine that islands are generally ancient. Doubts that they are remnants of continents.
| Author: | Charles Robert Darwin |
| Addressee: | Samuel Pickworth Woodward |
| Date: | 27 May [1856] |
| Classmark: | Natural History Museum, Library and Archives (General Special Collections DC AL 1/5) |
| Letter no: | DCP-LETT-1879 |
| letter | (3) |
| Darwin, C. R. | (2) |
| Woodward, S. P. | (1) |
| Woodward, S. P. | (2) |
| Darwin, C. R. | (1) |
| Darwin, C. R. | (3) |
| Woodward, S. P. |
