58 



Table 2. — Period of incubation in yellow fever, etc. — Continued. 

 [Eeed and Carroll: " The etiology of yellow fever; a supplemental note," Am. Med., Feb. 28, 1902.] 



Cases 6 and 7 were inoculated subcutaneously with 3 cc. of an equal volume of water and 

 serum filtered through a Berkefeld filter. 



[Marchbux, Salimbeni, and Simond: "La fievre jaune," Rapport de la mission francaise, Insti- 

 tute Pasteur, Annales, November, 1903.] 



« Intravenous injection of 1.75 cc. serum diluted with an equal volume of salt solution and 

 filtered through a Chamber land B filter. 



^Intravenous injection of 2.5 cc. serum diluted with an equal volume of salt solution and 

 filtered through a Chamberland B filter. 



"Intravenous injection of 2.5 cc. serum diluted with an equal volume of salt solution and 

 filtered through a Chamberland B filter. 



It will be noted from these 17 cases that the period of incubation of 

 yellow fever produced by the inoculation of blood or blood serum is 

 not so constant a factor as in Table 1, in which the disease was in- 

 duced by the bites of mosquitoes. 



The shortest time in this table is one day fifteen hours, and the long- 

 est twelve days eighteen hours. 



Surg. H. R. Carter, Public Health and Marine-Hospital Service, 

 has given special attention to this phase of the subject, and we are in- 

 debted to him for valuable suggestions. 



THE PILTEATI0N OP YELL0W-FEVEE BLOOD. 

 Reed and Carroll (Am. Med., Feb. 22, 1902) were the first to filter 

 yellow-fever blood and prove the, infectiousness of the filtrate. They 

 passed it through a Berkefeld filter, which on testing held back the 

 Staphylococcus pyogenes aureus. 



