Introduction Refutation of Psychologism I. Psychologism, its arguments, and its response to common counterarguments II. The prejudices of psychologism, fact and essence III. The fundamental phenomenological consideration I. The thesis of the natural attitude and its exclusion II. Consciousness and natural reality III. The realm of pure consciousness IV. Encyclopaedia Britannica article I. Pure psychology, its field of experience, its method, its function II. Phenomenological psychology and transcendental phenomenology III. Transcendental phenomenology and philosophy as a universal science in absolute justification IV. Psychologism and the transcendental foundation of logic V. Essences revealed through eidetic variation VI. Notes VII. References VIII. Textual citations.