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".

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.