DRAPETOMANIA, OR THE DISEASE CAUSING NEGROES TO RUN AWAY

http://en.wikipedia.org/wiki/Drapetomania
http://www.pbs.org/wgbh/aia/part4/4h3106t.html ("Diseases and Peculiarities of the Negro Race," by Dr. Cartwright)
http://xroads.virginia.edu/~HYPER/wpa/wpahome.html (American Slaves Narratives- An Online Anthology)