12 



the bites of mosquitoes at night. Persons having malaria should be 

 carefully screened at night to prevent them from being bitten by mos- 

 quitoes, which, becoming thus infected, would become potential car- 

 riers of the disease. Such patients, systematically treated with 

 quinine, the dose being always given at the beginning of the chill, will 

 soon be rid of the disease. The time of the dose is important, and the 

 reasons for the time have been abundantly proven by the study of the 

 life of the parasite in the blood cells. 



All of this advice is given only after abundant demonstration of 

 the eflBcacy of the methods. These measures have been followed with 

 success in the most malarious localities in the world, and with this 

 knowledge there is no good reason why an individual should contract 



Fig. 5. — Eggs and larvae of Culex. Enlarged (author's illustration). 



malaria in his own home, no matter how much malaria exists around 

 him. 



Of course, however, there may be occasions where it is almost 

 impossible to avoid contracting the disease. For example, the 

 writer was once waiting for a night train one evening in a small 

 Western town where there were irrigating ditches near the station. 

 In these ditches malarial mosquitoes were breeding profusely, and 

 the insects abounded in the station waiting room and on the plat- 

 form. Nothing but a gauze covering would have kept them away, 

 and several bites were inflicted on the hands and neck. Fortunately, 

 none of the individuals could have bitten a malarial patient, as the 

 disease was not transmitted. 



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