  In his influential 1957 article, Grice distinguished between two uses of ‘mean’. One use is exemplified by remarks such as ‘Those clouds mean rain,’ and ‘Those spots mean measles.’ The notion of meaning in play in such cases Grice dubs ‘natural meaning’. Grice suggests that we may distinguish this use of ‘mean’ from another use of the word more relevant to communication, exemplified in such utterances as