MALTA FEVER, MALARIA, YELLOW FEVER 141 



MALARIA : YELLOW FEVER. 



It was in 1880, that Laveran, a French Army- 

 Surgeon in Algeria, first saw the plasmodium 

 malarice, in the blood of one of his patients.* In 

 1894, Sir Patrick Manson set to work on the theory 

 of the transmission of malaria from man to man by 

 the mosquito. In 1895-96, came the work of Sir 

 Ronald Ross, and of MacCallum. By 1898, Ross 

 had discovered and proved the whole cycle of the 

 development of plasmodium malarias ; how it must 

 go through a phase of changes in the mosquito, 

 before it is put back into human blood. In 1899 

 and 1900, many Expeditions were sent out, from 

 diverse countries. In 1900, also, among many 

 voluntary experiments on man, were those made at 

 Ostia and in London : 



1. From June to October, throughout the 

 " malarial season," a mosquito-proof hut was 



* " Le 6 novembre, 1880, j'examinais le sang (Tun malade 

 en traitement pour fievre intermittente a Thopital militaire 

 de Constantine, lorsque je constatai pour la premiere fois 

 Texistence de filaments mobiles qui adheraient aux corps 

 pigmentes et dont la nature animee n'etait pas douteuse. 

 J'eus & ce moment meme Pintuition que j'etais en presence 

 des veri tables microbes du paludisme." Laveran, Traite des 

 Fievres Palustres, 1884. It is to be noted, moreover, that 

 he says: "Les moustiques jouent-ils un role dans la patho- 

 genie du paludisme comme dans celle de la filariose ? La 

 chose n'est pas impossible : il est a noter que les moustiques 

 abondent dans toutes les localites palustres." 



