Before now, there has been no comprehensive analysis of the multiple relations between A. Comtes and J.S. Mills positive philosophy and Franz Brentanos work. The present volume aims to fill this gap and to identify Brentanos position in the context of the positive philosophy of the 19th century by analyzing the following themes: the concept of positive knowledge; philosophy and empirical, genetic and descriptive psychology as sciences in Brentano, Comte and Mill; the strategies for the rebirth of philosophy in these three authors; the theory of the ascending stages of thought, of their decline, of the intentionality in Comte and Brentano; the reception of Comtes positivism in Whewell and Mill; induction and phenomenalism in Brentano, Mill and Bain; the problem of the "I" in Hume and Brentano; mathematics as a foundational science in Brentano, Kant and Mill; Brentanos critique of Machs positivism; the concept of positive science in Brentanos metaphysics and in Husserls early phenomenology; the reception of Brentanos psychology in Twardowski; The Brentano Institute at Oxford. The volume also contains the translation of the most significant writings of Brentano regarding philosophy as science. I. Tanasescu, Romanian Academy; A. Bejinariu, Romanian Society of Phenomenology; S. Krantz Gabriel, Saint Anselm College; C. Stoenescu, University of Bucharest.