Dear Andy;- This be what I gone do: I'd like to use your well-thoughtout letter in the March issue of EPINET. I will probably trim it a bit, but nothing to change meanings or emphasis. I got one more little question: Although all members of a species "CAN" theoretically inter-breed. In many case they don't. Although members of the same species, I have never heard of a Great Dane being mated with a Pekinese. I also doubt if the Pygmies of the Ituri rain- forest have ever mated with Watusi or Lithuanians. So the question I have is: Over great lengths of time, does such separation evolve into further speciation? Are we just talking likelihood? Art