Mosquitoes and Yellow Fever 129 



sleeping between the same sheets that had been 

 used by a patient dying of yellow fever and expos- 

 ing themselves in every possible way to the soiled 

 clothing. But no disease developed. That these 

 men were susceptible was shown later by inocu- 

 lating some of them, when they developed the 

 disease. 



In another experiment certain men in a camp 

 allowed themselves to be bitten by mosquitoes that 

 had passed through the proper period of incuba- 

 tion and every one of them and no others con- 

 tracted the disease. It was also shown that a mos- 

 quito was capable of communicating the disease 

 as long as fifty-seven days after it had bitten a 

 yellow fever patient. Another set of experiments 

 showed that a subcutaneous injection into a non- 

 immune of a very small quantity of blood from the 

 veins of a yellow fever patient in the first two or 

 three days of the disease would produce the fever. 



SUMMARY OF RESULTS 



Since that time much other work has been done 

 by independent workers as well as by French and 

 English Commissions both working at Rio de 

 Janiero. The results of their investigation are 

 practically the same and may be summed up as 

 follows : 



