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[Bill Shear]

>But the point is, surely, that many other perfectly non-supernatural
>evolutionary processes are known. For example, Darwin made much of sexual
>selection. Bottlenecks and founder effects can set populations onto new
>trajectories. And a host of molecular mechanisms have been described.
>Natural selection is NOT the only known explanation for EVOLUTION.

Of course.  That was not my point; I was referring only to adaptation, as
was Ridley.  The reason I like and use the Ridley book is that, while very
sound on natural selection, he treats extensively of the many other causes
of genetic and phenotypic change over time (evolution)--and the book is
readable and accessible to undergraduates.

Bill Shear
Department of Biology
Hampden-Sydney College
Hampden-Sydney VA 23943
(804)223-6172
FAX (804)223-6374
email<bills at hsc.edu>