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abundant in every bedroom in that area in which a proper search was 

 made. The breeding-places seemed to be segregated pools at the 

 edge of the pond (the pond itself contained fish), and post-holes, and 

 excavations. These last were numerous, as many buildings were 

 going up. 



The following practical measures were recommended : (i) Exter- 

 mination, as far as possible, by a party of men sent out for the 

 purpose, of all Anopheles found in houses, and systematic introduction 

 of screens in windows and doors. (2) Filling in of the smaller 

 breeding-places, and drainage of the pond. (3) Continuous seclusion 

 of every malarial patient, by netting or otherwise, from the bite of 

 mosquitoes while he had germs in the capillary blood ; if possible, the 

 sending away of the cachectic cases till danger of relapse was certainly 

 passed. 



These measures were intelligently put into operation at once ; 

 and the results were as prompt as they were gratifying. Not a single 

 new local case of malaria developed. Anopheles disappeared promptly 

 from houses where it had been previously a night terror, and Culex 

 was greatly diminished in numbers. The local authorities expect 

 during the coming spring to carry out the same measures even more 

 rigidly, and believe that both mosquitoes and malaria will entirely 

 disappear there. 



Vital Statistics of Havana, Guanabacoa, and Regla, 

 by Major W. C. GORGAS, Surgeon U.S. Army, 

 Chief Sanitary Officer. April, 1901. 



The condition of the city with regard to yellow fever is most 

 encouraging. It will be seen from the body of the report that for the 

 month, we have had two cases of yellow fever and no deaths. This 

 is the smallest April report of which we have any record. We went 

 from the 8th March to April 2oth with no cases, a period of 43 days. 

 In 1900 the longest period was from March 26th to April ist, both 

 inclusive, 7 days. As the population, subject to yellow fever, is con- 



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