The project of naturalising phenomenology is examined within the larger context of the philosophy of science. Transcendental phenomenology, as defended by Husserl, in opposition to the naturalistic enterprise, reflects a particular way of thinking about philosophy and its relationship to the empirical sciences that stands as an obstacle to the project of naturalisation. This paper develops a critique of a basic assumption made in this conception of philosophy, namely that it is possible to ask and answer questions concerning knowledge in the abstract, prior to and independently of the various investigative contexts which are the immediate concern of practicing scientists. To successfully naturalise phenomenology, we need to abandon this conception of philosophy.