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From Hubert Airy   17 March 1873

Summary

Thanks for congratulations on appearance of abstract of HA’s paper [Nature 7 (1873): 343–4].

Explains again his theory of "contraction with twist" by which compact buds and a spiral phyllotaxy have evolved. Explains how the peculiar phyllotaxy of the teasel is explicable by this process of "condensation".

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  17 Mar 1873
Classmark:  DAR 159: 26
Letter no:  DCP-LETT-8812

From William Pengelly   17 March 1873

Summary

CD’s notice in Nature [Collected papers 2: 171–2] induces WP to send letters from correspondents recounting stories of a dog that learned to open a door and of another that found his way home from London to Cowes.

Author:  William Pengelly
Addressee:  Charles Robert Darwin
Date:  17 Mar 1873
Classmark:  Pengelly ed. 1897, pp. 229–30
Letter no:  DCP-LETT-8813
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