Freeman Bibliographical Database
| Identifier: | F352 |
| Date: | 1887 |
| Concise reference: | Darwin, C. R. 1887. On the tendency of species to form varieties. In Life and letters (No. F1452-) vol. 2, pp. 120-125. |
| Detailed reference: | 352. 1887- In Life and letters (No. 1452-) vol. II, pp. 120-125. The letter to Asa Gray is printed in full. |