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Aletter from Gottfried Mayer to our readers and friends is at http://www.comdig.de/GMLetter.html
Just as species can shade off into a maddening continuum of subspecies, populations and hybrids, languages dissolve into an untidy collection of dialects and intermediate forms. And the rampant borrowing of words between languages resembles, graphically at least, the promiscuous horizontal gene transfer that microbes engage in.
There are limits to the analogy. It is unclear, for example, what the 'selection pressures' are for language, if any.