Speaking in tongues

On Sunday we heard Nicholas Ostler talk about his new book on Latin. He's not quite the typical bloke you'd meet down the pub:

A scholar with a working knowledge of twenty-six languages, Nicholas Ostler has degrees from Oxford University in Greek, Latin, philosophy, and economics, and a Ph.D. in linguistics from MIT, where he studied under Noam Chomsky.

He told me that he knew "around eighteen" languages. I suppose it gets a bit confusing after the first three or four. Later on I saw Mr Ostler lurking in the Scottish history section of the bookshop. Does he speak Gaelic? Probably by the end of visit to Scotland.