 In this reply to Bradley, Russell is taking care to point out that he is using the term “analysis” to designate a process performed by us of “discovery of the constituents of the complex” (Russell 1910: 374). This signifies a departure from his claims in the Principles of Mathematics, where he argued that propositional unities could not be analyzed because analysis would destroy the unity of the proposition (Russell 1903: 50–51). This shift in the understanding of the notion of “analysis” from ontological breaking down of unities to something that we perform when we are discovering constituents of complex entities, allows Russell to say that complexes are the only objects that can in fact be analyzed.