I'm using "theta", "chi", "gamma" more or less as in IPA; "eth", as in
Old English, to refer to voiced "theta".
I read in Lehmann that OI phonology contained the set of stops p/b,
t/d, k/g which lenited in a pretty regular system to fricatives: p ->
f, b -> v, t -> theta, d -> eth, k -> chi, g -> gamma under various
phonological conditions. Similarly m -> nasal v. But at some point in
history lenited d fell together with lenited g; at some point lenited t
became h. Both of these occur in the modern language, both Irish and
Scots. Of course there are complications, e.g. with palatalization; and
some interesting things have happened to 'v'.
But sticking to the basic pattern above for now, I wonder whether it is
known with any degree of certainty when the changes in lenited d & t
occurred? Even more interesting would be any explanation for these
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