 In each of these examples, the implication is that the internal vehicle of my musings could in principle be private (as Kenny [1966, p. 369] showed, this vehicle does not have to be a language for the argument to apply to it): for these problems and theories even to make sense, sharability must be irrelevant to meaning and it must be at least conceivable that my knowledge, even my understanding, is necessarily confined to my own case. The implication is of course often denied. The terms of Fodor’s language of thought, for example, are supposed to be able to refer to public objects. But the question is, on what basis does this ability rest? However this question should be answered, Fodor himself was concerned enough about Wittgenstein’s argument to try to show both that it did not apply to his views and—apparently superfluously—that it is not a good argument anyway (Fodor pp. 68–73). The matter is clearer with Descartes (compare Kenny 1966): for his sceptical question to be raised without being immediately self-defeating, he must hold it possible to identify his experiences inwardly—where ‘inwardly’ means without relying on resources supplied by his essential embodiment in a world whose existence is independent of his own mind and accessible to others (e.g., such resources as the concepts acquired in a normal upbringing). The question which accordingly looms large in the private language argument is: How is this identification of one’s experiences to be achieved?