§121

There is no metaphilosophy. We shouldn't think that there is just because one of the words that philosophers might look at the use of is 'philosophy' (and there have been confusions around the correct use of this term similar to confusions surrounding other terms - thinking that there is some essential feature of philosophy).
There is no second-order/meta-orthography - even though 'orthography' is a word that might be looked at in orthography (the study of the conventional spelling system).

Note: I notice Paul Horwich has a new book - Wittgenstein's Metaphilosophy - but I haven't read it. Has he acknowledged this passage?