Old Japanese

   Eric Christopherson / *Aiworegs Ghristobhorosyo  writes:

Actually, now that I think of it, are you sure you've got that rule right?
 Things might have changed strangely since Old Japanese, but it seems to me
 the first consonant of the second word gets *voiced*, e.g.: *pito-pito >
 hitobito, *matu-pa > matsuba, *oo-tanuki > oodanuki.

  Sounds interesting, are there any books on Old Japanese grammar
I've been looking for a really long time, but all I've come up with
is a book of Basho's haiku in the original.