In the third of his Logical Investigations, ¹ "On the Theory of Wholes and Parts," Husserl introduces a distinction that stands out as essential to the phenomenological project. His distinction between wholes and parts, and between different kinds of parts, provides Husserl with a formal structure that is crucial to the peculiar approach to philosophical problems that is distinctive for phenomenology. Several scholars have shown the importance of this theory by pointing out how it is operative in Husserl's phenomenology.²