WOEKS OF EEFEEENCE 409 



361. Eomanes. — "Scientific Evidences of Organic Evolution," 



London, 1882. 



362. Eomanes. — "An Examination of Weismannism," Cliicago, 



1893. 



363. Schmidt. — " The Doctrine of Descent and Darwinism," 



New York, 1878. 



364. Semper. — "Animal Life as Affected by the Natural Con- 



ditions of Existence," New York, 1881. 



365. Spencer. — "The Principles of Biology," two volumes, 



New York, 1866. 



366. Thompson.—" The Study of Animal Life," New York, 



1892. 



367. Wallace. — "On Natural Selection," London, 1870. 



368. Wallace. — "Darwinism," New York, 1891. 



369. Weismann. — " Essays upon Heredity and Kindred Biolog- 



ical Problems," Oxford, 1891 and 1892. 



370. Weismann.— " The Germ Plasm," New York, 1893. 



