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PHILADELPHIA, PA., FEBRUARY, 1901. 



IT is interesting to observe the comparatively slow growth 

 of science along some lines and to see how most important facts 

 are overlooked until attention is attracted to them by si ma- 

 great event that appeals to many minds at once and cans* 

 great awakening. The large mortality from typhoid fever 

 during the late Spanish-American war has created a wide- 

 spread interest in the subject of the transmission of disease- by 

 inst-cts, and main- important papers have recently appeared 

 bearing on this subject. At the present time the importance 

 of these studies and observations is fully recognized, and there- 

 is absolutely no doubt that insects play a most important part 

 as ;etological factors in disease. To show the comparatively 

 slow growth of the subject, it may be mentioned that in iSoj 

 ])r. John Crawford, in the "Baltimore Observer," published 

 a paper on the " Mosquital Origin of Malarial Disease." The 

 "New Orleans Medical and Surgical Journal," vol. iv, pp. 

 563-601, 1848, contains an article by Dr. Josiah Xott, in which 

 he mentioned that the " mosquito of the lowlands" was the 

 cause of malaria. In 1871, Dr. Joseph Leidy stated his belief 

 that hospital gangrene was disseminated by house-flies ( 1'; 

 Acad. Xat. Sci. Phila., 23, 297 >. Dr. A. F. A. King deserves 

 great credit for his brilliant article published in the " Popular 



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