1916] Reducing Malaria 281 



All barracks were of about the same size, type, and held about 

 the same number of people each. Yet the Columbian camp had a 

 much larger percentage of mosquitos than any other camp, and 

 were it not that it had four traps, the amount of mosquitos 

 would more than be double. To understand this pecularity, 

 it is necessary to understand the peculiar behavior of these 

 several types of people, and I briefly outline the more important 

 of these peculiarities. The Spaniard as a rule prefers to lounge 

 outdoors until quite dark. The door to his barrack is practically 

 closed during dusk, the period of maximum mosquito (anophe- 

 lene) activity. The West Indian is much like the Spaniard in 

 this respect. The Columbian, on the other hand, is much more 

 restless, goes in and out of his camp during the hours of dusk 

 with much frequency and often leaves his doors wide open. 

 The East Indian stays inside of his barrack almost exclusively. 

 Therefore the entrance to his home is kept closed most of the 

 time. Constant opening of doors during the period of dusk, 

 particularly doors on the lee sides of buildings, will admit large 

 numbers of malarial mosquitos. 



The malarial rate for the four types is given in the following 

 comparative table. 



Malaria Statistics, January 2 to April 27, 1912. 



(17 Weeks.) 



A. Population. 



Spaniards 503 



Columbians 60 



West Indians 102 



East Indians 47 



B. Malaria Data. 



Total Avr. Num. Num. per 100 

 Cases per wejk Sick per Week 



Spaniards 153 9.2 1.85 



Columbians 11 0.7 1.18 



West Indians...; -44 2.6 2.55 



East Indians 2 0.1 0.21 



The East Indian (hindoo) is the one with the least malaria, 

 due not to immunity, but becasue of his habit of staying 

 indoors during dusk. Economically considered, the hindoo 

 is the least expensive type of labor, considering cost of 

 hospital treatment. The Spaniard and West Indian, roaming 

 outdoors during dusk, when anophlenes are most active, and 

 being quite susceptible to malaria, show the biggest percentage 

 of cases. The Columbian, native of the region and a veteran 



