ABSTRACT
This chapter lists the ingredients of John Locke version of what Manser calls sense-datum empiricism. It examines what Ludwig Wittgenstein says about some of these ingredients. It is a consequence of language being derived from reality via experience, with experience conceived of according to the impression theory of perception. It is the one which has, as its consequences, the problem of privacy, and the empiricist deduction. Wittgenstein's attitude to the empiricist deduction is clear from a number of his remarks. The concept of a rule of language plays a comparable role in Wittgenstein's later philosophy of language. What Wittgenstein says about rules carries the implications that language cannot be private, in the relevant sense, and that the agreement of language and reality is something other than a matter of the former conforming to the latter. Hence a private language is not really a language.
