MALARIA AND MOSQUITOES 115 



emphasized by mentioning that the discovery of the 

 relation of the mosquito to the malaria resulted 

 from the patient work of Ross on the malarial 

 parasites of birds, and the interrelation of the gnat 

 and the bird. This knowledge once acquired, the 

 application of it to the human disease was relatively 

 easy, and the adoption of preventive measures in 

 relation to mosquitoes has led largely to the triumph 

 of man over malaria. 



It may be of interest to add that the malarial 

 parasites have been cultivated recently by adding a 

 very small quantity of a sugar, called glucose, to 

 malarial blood taken from the human body, and 

 then kept at blood-heat in a tube inside an incubator. 

 The multiplicative cycle of the malarial parasite, as 

 seen in the blood, is then passed through in the 

 culture tube. The method is also applicable to 

 another blood-parasite, Babesia, found in animals. 

 By the study of such cultures it is hoped to learn 

 more about possible immunity against malaria in the 

 future. 



