 His article "Psychology" for the ninth edition of the "Encyclopædia Britannica" was enormously influential – criticising associationist psychology with an emphasis upon the mind's active attention to the world.He was elected to the new Chair of Mental Philosophy and Logic in 1897 and his students included G. E. Moore, Bertrand Russell, and George Stout.He was president of the Aristotelian Society from 1919 to 1920; his wife Mary (née Martin) was a lecturer in moral sciences at Newnham College, a suffragist and a member of the Ladies Dining Society in Cambridge.