The paper focuses on the theory of cognition developed by Richard Burthogge, the lesser known seventeenth-century English philosopher, and author, among other works, of Organum Vetus & Novum (1678) and An Essay upon Reason and the Nature of Spirits (1694). Although his ideas had a minimal impact on the philosophy of his time, and have hitherto not been the subject of a detailed study, Burthogge’s writings contain a highly original concept of idealistic constructivism, anticipating Kant’s idealism. Therefore, a closer examination (...) of his philosophy can not only deepen our understanding of early modern British thought, but may also shed new light on the internal dynamics of the development of the whole post-Cartesian epistemology. (shrink)