There is a tendency in nature to the continued
progression of certain classes of varieties further
and further from the original type.
Alfred Russel Wallace was a British naturalist, geographer, anthropologist and biologist.
He (independently of Charles Darwin) proposed a theory of Evolution by Natural Selection (see Biological Basis of Biodanza)
Wikipedia: http://en.wikipedia.org/wiki/Alfred_Russel_Wallace
The Alfred Russel Wallace Page: http://www.wku.edu/~smithch/index1.htm
Project Gutenberg Online Books: http://www.gutenberg.org/browse/authors/w#a955
Quotes:
http://www.brainyquote.com/quotes/authors/a/alfred_russel_wallace.html
http://www.iol.ie/~spice/quotes.htm
http://en.wikiquote.org/wiki/Alfred_Russel_Wallace
Interviews: http://www.wku.edu/~smithch/index1.htm
Understanding Evolution, "What is evolution and how
does it work?":
http://evolution.berkeley.edu/evolibrary/search/topicbrowse2.php?topic_id=41
Understanding Evolution, "Natural Selection: Charles
Darwin & Alfred Russel Wallace":
http://evolution.berkeley.edu/evolibrary/article/0_0_0/history_14
Alfred Russel Wallace, Contributions to the Theory
of Natural Selection. A Series of Essays
,
MacMillan, 1871:
http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa&idno=AJP5195.0001.001&view=toc
Alfred Russel Wallace, Darwinism - An Exposition
of the Theory of Natural Selection with some of its
Applications
, MacMillan, 1889:
http://www.gutenberg.org/files/14558/14558-h/14558-h.htm
Jonathan Rosen, Missing Link - Alfred Russel
Wallace, Charles Darwin's neglected double
,
The New Yorker, February 12, 2007:
http://www.newyorker.com/arts/critics/atlarge/2007/02/12/070212crat_atlarge_rosen
Charles H. Smith, Alfred Russel Wallace -
Evolution of an Evolutionist
, 2003:
http://www.wku.edu/~smithch/wallace/chsarwp.htm