xvi CONTENTS 



CHAPTER PAGE 



IX THE PRODUCTION OF EXPLOSIVES 134 



By Charles E. Mimroe 



X THE CHEMICAL WARFARE SERVICE 148 



By Clarence /. West 



THE ROLE OF THE EARTH SCIENCES IN 

 THE WAR 



XI CONTRIBUTIONS OF GEOGRAPHY ....... 177 



By Douglas W . Johnson 



XII CONTRIBUTIONS OF GEOLOGY ... .... 196 



By Douglas W. Johnson 



THE ROLE OF ENGINEERING IN THE WAR 



XIII ADVANCES IN SIGNALLING CONTRIBUTED DURING THE 



WAR .' .' ^ . . 221 



By A. E. Kennelly 



XIV CONTRIBUTIONS OF METALLURGY TO VICTORY . ^ '. ' . 247 



By Henry M. Howe 



THE ROLE OF BIOLOGY AND MEDICINE IN 

 THE WAR 



XV THE FOOD PROBLEM 265 



By Vernon Kellogg 



XVI THE WAR SERVICE OF THE MEDICAL PROFESSION . . 277 

 By Frederick F. Russell 



XVII SOME DISEASES PREVALENT IN THE ARMY .... 291 

 By Frederick F. Russell 



XVIII ADVANCES IN SURGERY DURING THE WAR . . . . 311 

 By John W. Hanner 



XIX PREVENTIVE MEDICINE AND THE WAR . . . . 328 

 By Victor C. Vaughan 



