 In late 1919 Collingwood wrote an extensive survey of the history of the ontological proof, together with an analysis of the argument. This survey was given as a series of lectures in the early 1920s. He drew on this material in some of his later work, especially in Faith and Reason (1928), An Essay on Philosophical Method (1933) and An Essay on Metaphysics (1940). In 1924 Collingwood wrote Speculum Mentis. This was a dialectic of what he termed “forms of experience”: art, religion, science, history, and philosophy. During this period he was also lecturing on ethics, Roman history, the philosophy of history, and aesthetics: his Outlines of a Philosophy of Art (based on his lectures) was published in 1925.