Xll PREFACE BY TRANSLATOR. 



been seen by the investigator. The commission sent to 

 Havana last summer for the investigation of yellow 

 fever, was instructed to pursue this method, and was 

 accompanied by a photographer and supplied with all 

 the necessary appliances for carrying these instructions 

 into effect. 



The superficial reader may find much to criticise in 

 the work of Dr. Magnin, but I am convinced that 

 those who read it carefully cannot fail to be pleased 

 with the truly scientific spirit in which it is written ; 

 the fairness with which conflicting opinions are stated ; 

 the caution manifested as to the drawing of definite 

 conclusions where questions are still under discussion ; 

 and, above all, the extent of his literary researches and 

 the systematic way in which he has arranged the re- 

 sults. 



For the naturalist, for the physician, or for the non- 

 professional man of general culture, who desires to have 

 accessible in a condensed form the most important re- 

 sults achieved in this line of inquiry up to the present 

 day, this volume cannot fail to be of value ; while for 

 the student and the investigator in search of fuller 

 information, the summary given of the labors of nu- 

 merous individuals, together with the copious bibliog- 

 raphy, which I have brought up to date, will doubtless 

 be of service. Believing this to be true, it has been a 

 pleasure for me to devote a portion of my summer vaca- 

 tion to the translation of this little volume. 



G. M. S. 

 SALEM, MASS., August 1, 1880. 



