Century flew TKHorlfc Series 



W. F. WlLLOUGHBY, GENERAL EDITOR 



THE NEW WORLD OF SCIENCE 

 Edited by Robert M. Yerkes 



POLITICAL SYSTEMS IN TRAN- 

 SITION 



By Charles G. Fenwick 



THE WORKERS AT WAR 



By Frank Julian Warne 



Other titles will be published later 



