Your PDF has successfully downloaded.
You may be interested in finding more content on these topics:
You are not currently logged in.
Access JSTOR through your library or other institution:
Variations of Species
A. H. Curtiss
The American Naturalist
Vol. 4, No. 6 (Aug., 1870), pp. 352-355
Stable URL: http://www.jstor.org/stable/2447081
Page Count: 4