16 GROWTH OF SANITATION IN THE TROPICS 



destruction of the yellow fever mosquito,— ?and yellow 

 fever disappears in toto. So that by the term " applied 

 hygiene," I wish the reader to understand the adoption 

 of measures specifically directed to the destruction of 

 those insects or parasites which are directly concerned 

 witli spreading infectious diseases, and to bear in mind 

 that the measures necessary against one disease are not 

 necessarily those suitable for other diseases. That, in 

 other words, each disease, like malaria, yellow fever, 

 INIalta fever, sleeping sickness, ankylostomiasis, etc., etc., 

 requires the application of its own special prophylactic 

 measures. 



In subsequent chapters I will deal in detail with 

 these specific measures, and will be able to show the 

 astonishing improvement in tropical sanitation which 

 has taken place as the result of specially applied 

 hygienic measures, results, moreover, which would in 

 all probability have never been achieved if reliance 

 had been placed solely on general sanitation. 



