ILLUSTRATIONS 



Chart Showing Malaria Death-Rate at 

 Havana, 1871 to 1914 



Ant-Guards: Old Hospital AT Ancon . 



A Ditch at Ancon: Weeds Retarding 

 Water Flow ..... 



Jungle Covering a Stream . 



Map of the Canal Zone 



Meteorological Tables i to 9 . 



Rainfall: Curves for 1909, 1912, 1913 



A Topographic Change : Near Empire 



Constantly Changing Topography: Near 

 Miraflores 



Daily Change of Topography 



Blocked Water-Course Changed into an 

 Anopheles Breeding Place . 



Aquatic Vegetation Sheltering Larv^ 



Swamp near Balboa, Caused by Building of 

 Dikes 



13 

 18 



20 

 22 

 26 

 28 



37 

 38 



38 

 40 



42 

 48 



52 



