An investigatation of the influence of psychology and early phenomenology on the origins of analytic philosophy. This book is also of value for those interested in judgement, proposition, psychologism, logical realism, the problem of error, Gestalt theories, and tropes. “This book is one recent product of her work on this subject, which first saw light as a dissertation, then in a series of papers, and now appears in a revised and expanded version of her early work for the History of Analytic Philosophy series … . The perspective van der Schaar brings here is … a valuable addition to the detailed account of the early development of analytic philosophy at Cambridge.” (Consuelo Preti, Journal of the History of Analytical Philosophy, Vol. 4 (3), 2016) Maria Van Der Schaar is a lecturer at the Institute for Philosophy, Leiden University, The Netherlands. Her work regards the philosophy and history of logic with a special interest in the theory of judgement and assertion. She is the editor of Judgement and the Epistemic Foundation of Logic.