xvi Illustrations 



Pack-Mules, for Oil Transportation in 

 Jungle Trails 170 



The Larvacide Plant at Ancon . . .174 



Removing Vegetation from Overgrown 

 Streams ...... 192 



Screened Verandas : Ancon . . .192 



A Good Device to Prevent the Sagging of 

 Screened Doors ..... 201 



Types of Screened Houses : Colon Hospital 

 Grounds ...... 204 



Types of Screened Houses : Culebra . 206 



Screened Cars in Railroad Construction 



Camps ....... 206 



Table of Malaria Incidence at Construc- 

 tion Camps ...... 209 



Slapper, Chloroform Tube, Acetylene 

 Lamp, and Pill-Box; Used in Catching 

 Anopheles in Houses . . . .212 



Mosquito Trap, with Details of Con- 

 struction ...... 214 



Interior of Laborers' Barracks; where 



.4 ivoPHELfis WERE Caught Daily . .216 



Chart Showing Percentage of Employees 

 Sick with Malaria in the Wet Seasons 



of I9II, I9I2, AND I913 .... 221 



