Illustrations xvii 



PAGE 



Diagram Showing the Yearly Reduction 

 OF Malaria among Canal Employees . 226 



Chart Showing the Monthly Malaria 

 Sick-Rate from 1906 to 1914 . . . 228 



Map of Havana; Showing the Yellow 

 Fever District ..... 236 



Chart Showing the Prevalence of Yellow 

 Fever in Havana, Cuba .... 244 



Chart Showing Yellow Fever Cases on the 

 Isthmus from 1881 to 1889 . . . 264 



Part of the Panama Fumigation Brigade . 284 



Screened Vestibule Door . . . 286 



A Poorly Constructed Eave-Trough . . 288 



A Clogged Eave-Trough .... 288 



DLA.GRAM of A FiRMLY SUPPORTED EaVE- 



Trough 289 



A Firmly Supported Eave-Trough with a 

 Good Slope ...... 290 



Mosquito-Proof Water Barrel . . . 290 



A Short Length of Eave-Trough Used over 

 A Doorway ...... 310 



