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From Hubert Airy 8 January 1874
Summary
W. J. Beal’s paper ["Phyllotaxis of cones", Am. Nat. 7 (1873): 449–53] shows incompleteness of HA’s theory, but does not invalidate his basic principles on origin of leaf arrangement or the broad applicability of the theory.
| Author: | Hubert Airy |
| Addressee: | Charles Robert Darwin |
| Date: | 8 Jan 1874 |
| Classmark: | DAR 159: 28 |
| Letter no: | DCP-LETT-9232 |
From Hubert Airy 13 March 1874
Summary
Has rewritten paper on leaf arrangement after criticism by Royal Society referees. Has found new factor influencing leaf arrangement, i.e., spontaneous variability in the number of vertical leaf-ranks.
| Author: | Hubert Airy |
| Addressee: | Charles Robert Darwin |
| Date: | 13 Mar 1874 |
| Classmark: | DAR 159: 29 |
| Letter no: | DCP-LETT-9357 |
