Spencerism and the Causal Theory of Reference Wolfram Hinzen Abstract: Spencer's heritage, while almost a forgotten chapter in the history of biology, lives on in psychology and the philosophy of mind. I particularly discuss externalist views of meaning, on which meaning crucially depends on a notion of reference, and ask whether reference should be thought of as cause or effect. Is the meaning of a word explained by what it refers to, or should we say that what we use a word to refer to is explained by what concept it expresses? Only the latter view is Darwinian, I argue, in that conceptual structures in humans are an instance of adaptive structures, and adaptive relations to an environment are the effect rather than the cause of evolutionary novelties. I conclude with both the empirical implausibility and the methodological undesirability of a functionalist study of human concepts in the relational sense of 'function', as it would be undertaken in a paradigm that identifies meaning with reference or that gives reference an explanatory role to play for what concepts we have.