110 INSECTS AND MAN 



method of packing, with very few exceptions, most of the 

 mosquitoes arrived in London alive and in good condition. 

 All the mosquitoes that chose were allowed to feed again 

 on the day of departure, so as to keep them in as good 

 a state of nourishment for the journey as possible. As a 

 precautionary measure, especially for those that had not 

 fed on the day of departure, thin slices of water-melon or 

 other fruit were placed on the floor of the box beneath 

 each cylinder, in such a way that the insects might, if they 

 chose, suck up the juices through the rneshes of the netting. 

 " On their arrival in London, the infected mosquitoes were 

 set to feed on Dr P. T. Manson and on Mr G. Warren, 

 both of whom had volunteered to be inoculated. For this 

 purpose the closed cylinders containing the infected mos- 

 quitoes were placed over the hand or arm of the subject, 

 and the insects allowed to puncture through the meshes 

 of the netting. Shortly afterwards (about eighteen days 

 in one case, fourteen in the other) both subjects developed 

 characteristic tertian fever, and tertian malarial parasites 

 were found in abundance in their blood both at the time 

 and on the occurrence of the several relapses of malarial 

 fever from which they subsequently suffered." Thus 

 terminated one of the most picturesque, and withal, far- 

 reaching experiments in the annals of medical entomology. 

 The doubting Thomases were silenced, once for all; the 

 means for the amelioration and even eradication of malaria 

 was made clear to all who cared to profit by the lesson ; 

 and Sir Patrick Manson's prophecy, made when the experi- 

 ment was first mooted, that the scientists in the Roman 

 Campagna would suffer no harm, and that those bitten, in 

 England, by infected mosquitoes, would contract malaria, 

 was vindicated in no uncertain manner. 



YELLOW FEVER 



Yellow fever, that dread disease of the tropics, is carried 

 from man to man by a mosquito, Stegomyia fasciata (fig. 31), 



