Other
The Rise of Evolutionary Biology: Biology Before Darwin
These pages are part of a site called "Evolution," that accompanies a textbook by the same name. Mark Ridley is the author. Here he discusses theories for species change that were before Darwin published "On the Origin of Species."
CK-12 Foundation
Ck 12: Life Science: 4.2 Influences on Darwin
Learn about Darwin's influences that led to his discoveries of change in species over time.