From: fournet.arnaud
Message: 53851
Date: 2008-02-21
>> The change f to h or h to f=============
>> in either way is not rare.
>> Cf. after = Dutch achter.
>
>Which is not, strictly speaking, a change [f] > [h], but
>rather [f] > [x]. English has a number of sporadic examples
>of [x] > [f] (e.g., <laughter>, <rough>). I don't offhand
>know of any examples of [h] > [f].
>