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From Thomas Davidson 3 May 1861
Summary
Sends three tables on the known geological distribution of genera and subgenera of Brachiopoda. Has been continually puzzled by intermediate forms, and is convinced that the greater number of species can be linked together. "Natura non facit saltum."
| Author: | Thomas Davidson |
| Addressee: | Charles Robert Darwin |
| Date: | 3 May 1861 |
| Classmark: | DAR 99: 1–2 |
| Letter no: | DCP-LETT-3135 |
