PREFACE 



The material presented in this volume is based on 

 nearly four years of practical study of Malaria in Cali- 

 fornia, during which time virtually every part of the 

 state has been reached. The extent of the infested 

 area is limited to a comparatively few counties, and 

 here the problem is shown to be a controllable one, as 

 demonstrated by several successful anti malaria cam- 

 paigns. Concerted action backed by sufficient funds 

 to carry on a scientific and systematic crusade against 

 the Anopheles mosquito is all that is needed to free 

 California of malaria, and thus eliminate the one glaring 

 defect of this splendid state. 



A seven-years siege in his earlier experience with 

 malaria in the southern part of Ohio has given the 

 writer an interest in this malady which is of more than 

 scientific birth. 



This extensive study in California could not have 

 been possible but for the painstaking and loyal assist- 

 ance of graduate students who have given time and 

 energy, often under very trying conditions, and often 

 for little or no compensation. Much credit is due 

 Mr. Harold F. Gray, who, through his excellent equip- 

 ment and efficiency, has given indispensable assistance 

 in the preparation of this work. His careful reports 



