3i6 The Control of Mosquitoes 



The effect on the morale 0/ the employees. The 

 presence of yellow fever in a community has a 

 peculiarly depressing effect upon the non-immune 

 inhabitants. Yellow fever is one of the diseases 

 for which the human race may be said to have an 

 inherited phobia. It is well known that in 1904- 

 1905 special inducements were required to secure 

 desirable men for work on the canal and even 

 many of these soon left. We can testify from 

 personal experience to the panic which cases of 

 yellow fever occasioned among the American 

 employees, many of whom returned to the United 

 States within a few days after arrival, frightened 

 away by the presence of yellow fever. It is 

 obvious that the class of men who go to a yellow- 

 fever-ridden country might not be the best from an 

 economic point of view. 



The effect on the people and press of the United 

 States, etc. The btilk of the laborers were re- 

 cruited from Barbadoes, Jamaica, Trinidad, Spain, 

 Italy, and Greece. Would these countries have 

 permitted the emigration of a large number of 

 their non-immune citizens to a country where 

 yellow fever was rampant? Witness the action 

 taken by these governments to prevent emigra- 

 tion to the Manaos region, and Brazil region. The 

 skilled labor, professional and clerical employees, 



