The A. has attempted to show how, starting from the Prolegomena, taking account of the ideality of formal objects by Husserl reflects firstly on the conception of the theory of knowledge, which must accordingly justify its validity, and secondly on the apprehensionn of the knowing consciousness which is related to theses logical unrealities. The «logical reverberation» indicates this return movement of the ideal and a priori character of the objects on the acts of knowledge which concern them, thus positing the double theoretical framework of future phenomenology, namely the transcendental theory of knowledge and the possibility of a science of the pure conscience. (Transl. by J. Dudley).L'A. a voulu montrer comment, dès les Prolégomènes, l...