﻿STUDIES IN PLAGUE IMMUNITY. 253 



Table No. X. — Tests of the agglutinating value of human immune sera — Cont'd. 



Case No. 



Manner of inoc- 

 ulation. 



Dilutions. 



Results and remarks. 







1:10; 1:20; 1:40; 



After 2 hours faint precipitation of bac- 







1:80; 1:160; 2 



teria in dilution of 1 : 10. After 3 hours 







controls with- 



the same precipitation appears in the 



IV 



2 oesen " Pest 



out serum. 



dilution of 1 : 20. The control tube with 





Avirulent." 



1 control normal 

 human serum, 

 1 : 20. 



normal scrum and the remaining tubes 

 show no precipitation at this time. 







1:2; 1 : 10; 2 con- 



Moderate precipitation of bacteria after 2 







trols (no serum). 



hours in dilutions of 1 :2 and 1 :10. No 

 sediment in control tubes. 







1 control normal 



Slight sediment of bacteria after 3 hours. 



V 



_do 



human serum, 

 1:5. 

 1 control horse 



Positive after 1 hour. 









pest immune 









, serum, 1 : 10. 









1 : 10; 1 : 20; 1 : 40; 



After 2 hours marked precipitate of bacteria 







1 : 80; 3 controls 



in dilutions of 1 : 10 to 1 : 40. Controls 



V 



__do 



(no serum). 

 Control normal 



negative. 

 Negative after 2 hours. 









human serum 









1:10. 









1:2; 1:10; 1:20; 



After 2 hours marked precipitate of bacte- 







1 : 40; 1 : 80; 2 



ria in dilutions of 1 : 2 to 1 : 40. 



VI 



do 



controls (no 

 serum). 











Control normal 



Negative after 2 hours. 







. serum 1:10. 









1:2; 1:10; 2 con- 



After 2 j hours marked precipitate of bacte- 







trol s (no 



ria in dilution of 1:2 and 1:10. Con- 







serum). 



trols negative. 







Control normal 



After 3 hours moderate precipitate of bac- 



VII 



do _ 



human serum 

 1:5. 

 Control horse 



teria. 

 Positive after 2 hours. 









pest immune 









serum 1:5. 









1:10; 1:20; 1:40; 



After 1 hour marked precipitate of bacte- 







1:80; 1:160; 3 



ria in dilution of 1:40. After 2 hours 







controls (no 



marked precipitate in dilutions of 1:10, 







serum). 



1:20 and 1:80. Controls negative. 



VII 



do 



Control normal 

 | human serum 



Negative after 2 hours. 









1:10. 









Control horse 



Moderate precipitate after 2 hours. 







pest immune 









serum, 1 : 5. 





