PEACTICE OF MEDICINE AND HYGIENE 



the mosquito is the agent by which dengue is 

 spread. The recent work of Ricketts in Rocky 

 Mountain spotted fever, and of Deaderick in 

 black-water fever, constituted notable contri- 

 butions to the experimental observation of 

 these diseases. 



Malta fever has been exhaustively studied by 

 a commission appointed by the Royal Society 

 of London. It has been found that the Micro- 

 coccus malitensis is constantly present in the 

 blood of persons suffering with this disease, 

 that domestic animals are frequently infected, 

 and that the disease is largely acquired by man 

 using the milk of infected animals. An ef- 

 fective vaccine has been prepared from cultures 

 of the organism. 



Yaws, an infective disease common in tropi- 

 cal countries, has been found to be inoculable 

 to the monkey, in which animal it is now being 

 studied. 



The history of small-pox should be known 

 to all. It should be taught in public schools. 

 Jenner and his victory over this pestilence 

 should be as familiar to students as Wellington 

 and B Richer and their victory at Waterloo. 

 Some day they will be. The reduction of mor- 

 tality in this disease by vaccination is so great 



93 



Malta 

 fever. 



Yaws. 



Small-pox. 



