﻿STUDIES IN PLAGUE IMMUNITY. 



327 



noted. All the necessary controls were also performed as may be seen from the 

 tables where all the details of the reactions are given. The experiments were 

 performed with the sera of four of the human beings and of two guinea pigs which 

 had been vaccinated and with the serum of one plague immune horse. In each 

 of these instances the deflection of the complement was obtained, demonstrating 

 the presence of plague immune bodies in the serum tested. The results obtained 

 are summarized in the following tables. 



Table No. XI. — Showing phenomenon of fixation of the complement with the serum 

 of human beings and animals vaccinated against plague. 



[Saline suspension 0.85 per cent, q. s. to 4 cubic centimeters in each test tube.] 



Inacti- 

 vated 

 rabbits' 

 serum 

 hpemo- 

 lytic for 

 goats' 

 corpus- 

 cles. 



5 per 

 cent sus- 

 pension 

 goats' 

 corpus- 

 cles. 



Guinea 



pig's 

 fresh se- 

 rum for 

 comple- 

 ment. 



Vaccinated 



guinea pig serum 



(inactivated). 



Vacci- 

 nated 

 human 

 serum 

 No. I 

 (inacti- 

 vated). 



Normal 

 guinea 

 pig serum 

 (inacti- 

 vated). 



Normal 

 human 

 serum 

 (inacti- 

 vated). 



Saline 

 suspen- 

 sion of 

 strain 

 "Pest 

 Viru- 

 lent." 



Hemo- 

 lysis. 



No. I. 



No. II. 



0. 0025 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 

 .005 



1 

 1 

 1 



0.2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 o 



.2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 

 .2 















+ 

 + 

 + 

 + 



+ 



+ 

 + 

 

 

 

 

 



+ 



-r 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 -j- 

 

 

 

 

 

 

 

 

 

























1 



0.1 

 .025 





















0. 05 

 .025 























0.1 









.1 

 .025 









1 

 1 



1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 











.05 

 .025 



















.1 











0.25 

 .1 



.025 



























0.25 

 .1 

















.25 

 .1 



.025 





























.25 

 .1 















.1 

 .025 























.05 

 .025 























.1 

















.2 













.005 













































