Now one may
go on and ask: “How do you know that he has
got
39.
toothache when he holds his
cheek?” The answer to this might be,
“I say,
he has toothache when he holds his
cheek because I hold my cheek when I have
toothache”. But what if we went on
asking:– “And why do you suppose that
toothache corresponds to his holding his cheek just because your
toothache corresponds to your holding your
cheek?” You will be at a loss to answer this
question and find that here we strike rock bottom, that is we have
come down to conventions. (If you suggest as an
answer to the last question that, whenever we've seen
people holding their cheeks and asked them
“what's the matter”, they have answered,
“I have toothache”, ‒ ‒ ‒ remember that
this experience only co-ordinates holding your cheek with
saying certain words.)