170 



SOCIAL EVOLUTION 

 SUPPLEMENTARY READINGS. 



Buckle, H. T. — The History of Civilization in England. 



Dexter, E. G. — Weathc?- Influences. 



Huntington, E. — The Pulse of Asia. 



Semple, E. C. — The Influences of Geographic Environment. 



Thomas, W. I. — Source Book for Social Origins, Part I. 



Figure G1. A JJt'duuiii T<iil in thu Dc&crt. 



