At the end of the first decade of this century, Edmund Husserl published an article, Philosophie als strenge Wissenschaft ¹, which looks back ten years to his Logische Untersuchungen and looks forward to the highly individual publications of the next twenty years. It marks the maturity of an idea which had already begun to take shape in his studies of logic and which was to govern all his future philosophical activity -the idea of a presuppositionless philosophy, which is rendered possible by radical Selbstbesinnung. This is the idea of philosophy as transcendental phenomenology.