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From Hubert Airy [before 15] July 1872
Summary
Outlines his theory on the origin of existing orders of leaf arrangement. Believes spiral and whorled orders have evolved from a primitive distichous arrangement. These arrangements permit a compact bud form of small surface area that can withstand external changes in temperature, and in particular can tolerate frost.
| Author: | Hubert Airy |
| Addressee: | Charles Robert Darwin |
| Date: | [before 15] July 1872 |
| Classmark: | DAR 159: 16 |
| Letter no: | DCP-LETT-8412 |
