Biston betularia

[DR. JAMES ADAMS]

Dear leppers,

	I think one important point has been overlooked in this entire 
discussion.  Whether predation has been actually observed on 
Biston betularia doesn't change the fact that collections of the 
moths, made in virtually the same places during the decades from 
the middle 1800's to the late 1900's show a shift in the abundance 
of the morphs from light to dark in the late 1800's, and a shift back 
toward more light morphs in the mid to late 1900's.  *Something in 
nature* changed the frequency of the morphs, and it wasn't a 
differential susceptibility of light morph and dark morph caterpillars 
to factory produced pollution!

	James

Dr. James K. Adams
Dept. of Natural Science and Math
Dalton State College
213 N. College Drive
Dalton, GA  30720
Phone: (706)272-4427; fax: (706)272-2533
U of Michigan's President James Angell's 
  Secret of Success: "Grow antennae, not horns"