Monday. 16 February 1829: 'Went to the Royal Society. There Sir William Hamilton read an Essay, the result of some anatomical investigations, which containd a maskd battery against the phrenologists. It seems these worthies are agreed that the cerebellum is that part of the headpiece which influences the sexual organs and according to this hypothesis that same cerebellum should be stronger in men than in women, in adults than in children, in old men than in youths, in persons mutilated than in those who are in the natural state [...] But if Sir William's course of experiments are correct the very opposite is the truth.'