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To J. B. Hannay 22 June 1881
Summary
Suggests modification in JBH’s experiment on formation of diamonds.
Speculates about chemical products of constituents of living organisms when subjected to heat and pressure.
| Author: | Charles Robert Darwin |
| Addressee: | James Ballantyne Hannay |
| Date: | 22 June 1881 |
| Classmark: | American Philosophical Society (Mss.B.D25.592) |
| Letter no: | DCP-LETT-13214 |
