He wrote some very interesting letters to one of his friends who was J.D. Hooker, or at that time, president of the Royal Society, so the maximum scientific authority in Britain speaking about the brain in the plants.
Ele escreveu cartas muito interessantes a um dos seus amigos, J. D. Hooker, naquela altura o Presidente da Royal Society, na altura, a autoridade científica máxima  na Grã-Bretanha, falando do cérebro nas plantas.