§9

In §9 Wittgenstein looks more closely at the expressions introduced into the expanded language from §8. - He asks whether their use is taught ostensively (i.e. by pointing and uttering the word for the thing).

A word like 'this' is unlike words like 'red' and 'apple' in that it is used in ostensive teaching (you might say 'this apple' or 'this colour' and point.)

Wittgenstein is bringing our attention to the fact that words have a variety of quite different uses. - This is not something observed in the Augustinian picture.