Brentano's Four Phases of Philosophy, first published in 1895 and here translated into English for the first time, presents a dramatic account of the history of philosophy in terms of a succession of cycles of renewal and decline. Phases of renewal are associated with the rediscovery of science, of empiricism, of rigour and clarity. Phases of decline are associated with competing schools and sects, with mysticism and obfuscation, and with relativisms and idealisms of various sorts. Each final phase of decline, with its ultimate collapse into nonsense, gives rise to the call for a new phase of...