488 MAN CONTROLS HIS ENVIRONMENT FOR HEALTH 



He allowed himself to be bitten by a mosquito that was known 

 to have bitten a yellow fever patient, contracted the disease, and 

 died a martyr to science. Others, soldiers, volunteered to test 

 further by experiment how the disease was spread, so that in the 

 end the commission was able to prove that Aedes transmitted yel- 

 low fever. The accompanying illustration shows the result of this 



3S5T y^ 19 °° 



year 190i 



500 



























1 



i i i 





"100 

























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antirmosquito 

 ! campaign begZxn 





100 

















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api:>fayJura July O^.Sept.Q:t.>lov:Dee. Jan ."feb. Mac ApchbyJitDe MyAug.5eft0ct}k\/&c. 



In 1900, experiments were carried on to find the cause of yellow fever. In 1901, it was dis- 

 covered that the Aedes mosquito transmitted yellow fever and a campaign against mosquitoes 

 was immediately started. The above chart shows the effect of such a campaign in Havana. 



discovery for the city of Havana. For years Havana was con- 

 sidered one of the pest spots of the West Indies. When Americans 

 occupied that city, after the war with Spain, they cleaned up the 

 city, introduced proper sanitation, placed screens in most build- 

 ings, and so nearly destroyed the breeding places of the mosquitoes 

 that the city was practically freed of mosquitoes. The result, so 

 far as yellow fever was concerned, was startling, as you can see by 

 reference to the chart. 



Practical Exercise 20. Read the Health Heroes Series by Hallock and Tur- 

 ner, and make a report to the class on yellow fever. 



Self-Testing Exercise 



A commission headed by Dr (1) proved that the Aedes 



mosquito carries (2) (3). This disease was elimi- 

 nated in Havana by (4) the (5) (6) of 



mosquitoes, (7) the buildings, and introducing (8) 



(9). 



