>Matt Pearson wrote: >> Are you looking for conditioned or unconditioned changes from /s/ >> to /ts/? If unconditioned: I believe there are some South American >> languages in which fricatives underwent across-the-board fortition >> to become affricates. > >Were those influenced by languages with affricates but not fricatives? I don't know. All I remember is that there are certain Amazonian languages which have /ts/ but not /s/, and others where /s/ and /ts/ are in free variation. The language whose grammar sketch contained this fact was of the latter kind (I no longer remember the name of the language). Not very helpful, I know... Matt.