No Proto-Celtic?

[Leo A. Connolly]

"David L. White" wrote:

>> I have proposed that PIE *p appears as a voiceless bilabial fricative in one
>> inscription in ancient northern Italy (from Prestino; see MSS 58, 1988).

>         Just a not terribly significant note:  development from /p/ to /f/
> (or perhaps a bilabial voiceless fricative) to /h/ is presupposed in the
> common (though perhaps wrong?) etymology of the "Hercynian" forest as being
> both Celtic and relatable to /perkun/.  In other words, it is not always
> assumed that PIE /p/ in Celtic went straight to zero, though I am unaware of
> it leaving any traces in Insular Celtic.

Didn't /pt/ yield /xt/?

Leo Connolly