En réponse à Benct Philip Jonsson : >This is interesting as it is analogous to Japanese, where >historically *p\ changed to /h/, but retained a [p\] >allophone before *u (now /M/). I suspect we have to do >with an universal which prevents the delabialization >of [p\] before a fully labialized vowel. NB Japanese >/h/ has a [C] allophone before /i/ as well! I doubt it. In some dialects (Gasconic dialects IIRC), the f > h went all the way, including in front of [w] ("fire" is "huek" there). Christophe Grandsire. http://rainbow.conlang.free.fr You need a straight mind to invent a twisted conlang.