'Heterogeneous Equilibrium. Mr Sidgwick. Hil[ary] & Trinity Terms, 1924' notebook of Arthur Mourant Handwritten and hand-bound book of notes from lectures given by Nevil Sidgwick at Oxford University. Notebook written by Arthur Mourant (later FRS) who was then in his second year of university. The notebook contains diagrams, graphs, calculations and notes on heterogeneous equilibrium. 1924