1916] 



Reducing Malaria 



279 



through which Anopheles may enter. This is well illustrated 

 by the behavior of the curve at the point marked by a black 

 disc. At this period all cracks in camp 10 were stopped-up. 

 Note the sudden up-shoot of Anopheles in camp 5 due to this. 

 Up to this period the cracks present in camp 10 were the equiva- 

 lent of an extra door. The remainder of the chart is for camps 

 5 and 15, and the curve is almost as significant as the familiar 

 campaign literature advocating vaccination against small-pox. 



Chart B 



PECULIARITIES OF TRAP CATCHES. 



Eleven of the buildings of MiraFlores camp had insect traps 

 attached to them. Chart B presents a comparison of the trap 

 catch of the north-east and south-west sides of each building. 

 The percentages were arrived at the following manner : the total 

 number oi Anopheles caught during the nine weeks from Jan. 29 to 

 Mar. 30, 1912, in the S-W traps were divided by the number of 

 traps to give an average per trap. The same was done for the 

 N-E traps. , The total of these two averages in each building 

 was taken to represent 100%. The record for each building 

 was differentiated into Anopheles (almost wholly albimanus) 



