Not _absolutely_ impossible, just many times less probable than change in the reverse direction (intervocalic lenition of consonants is a highly natural process). Do you know of any well-documented examples of -r- > -t-? Intervocalic voicing of *-t- (with -d- as well as -r- or -l- as the end product) is demonstrable for many African languages.
 
I don't question the possibility of AN migration(s) towards Africa. We have Malagasy in Madagascar, of course, but that was a pretty recent event (the position of Malagasy in the Malayo-Polynesian branch is securely established and so is the approximate date of its separation from its closest relatives).
 
Piotr
 
----- Original Message -----
From: tgpedersen@...
To: nostratic@yahoogroups.com
Sent: Wednesday, April 18, 2001 3:17 PM
Subject: [nostratic] Re: Afro-Austronesian numerals ?


I think I finally agree with you. A pity indeed.
But are you really serious that eg. *r (> *d) > *t is impossible?


Torsten




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