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To Francis Darwin [before 15 April 1873]
Summary
Sends to Pantlludw [North Wales] bottle of formic acid. FD and Amy [Darwin] can search for spawn. If found, keep in two basins and add 6 drops of acid to one and look for differences.
| Author: | Charles Robert Darwin |
| Addressee: | Francis Darwin |
| Date: | [before 15 Apr 1873] |
| Classmark: | DAR 271.4: 6 |
| Letter no: | DCP-LETT-8848A |
