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THE RAMIFIED THEORY of types was five years in the making. A curious aspect of the historical evolution of the theory is that Russell began and ended with a theory of types. In this paper 1 give a survey of the foundational schemes which Russell considered and rejected in the five years during which his ideas on logic were in a continual state of flux. One of the themes that I wish to stress is the reluctance with which Russell adopted type distinctions. I shall go into this question in somedoi:10.15173/russell.v8i1.1735 fatcat:ome4z7rffzd4djqubceaihdkua