On Preventive Inoculation. 



261 



After that, the difference which was observed in the fate of the two 

 groups, the inoculated and uninoculatecl, is seen from the subjoined 

 table 







Occurrences in uninoculated. 



Occurrences 



in inoculated. 



Date of occurrence 

 of plague. 



Number of 

 uninoculated 

 present. 



Cases. 



Fatal. 



Number of 

 j inoculated 

 present. 



Cases. 



Fatal. 



1897. 



23rd to 29th January, 

 previous to the day 

 of inoculation. 





9 



5 









t S 

 © vs 



r Forenoon, be- 

 fore inocula- 





6 



3 









30.1.97, tl 

 of inocul 



- 



Afternoon, 

 after inocula- 







Q 

















1st day after inocula- 

 tion, 31.1.97 



2nd day after inocula - 



177 



172 . 



2 

 1 



1 

 1 



151 

 150 



1 





3rd day after inocula- 1 

 lion, 2.2.97 



5th day after inocula- 

 tion, 4.2.97 



6th day after inocula- 

 tion, 5.2.97 



7th day after inocula- , 

 tion. 6.2.97 i 



173 

 171 

 169 

 169 



1 



1 



9 



5 



1 



. 1 

 1 

 1 



146 

 146 

 146 

 146 



1 















Total after the day 

 of inoculation .... 



172 



uninoculated, 

 average daily 

 strength. 



12 



cases. 



6 



deaths. 



i 



147 



inoculated, 

 average daily 

 strength. 



2 



cases. 



No 

 deaths. 



* During the time under observation the number of uninoculatecl was reduced 

 on the second, fifth, and sixth day after inoculation by three, one, and one dis- 

 charged prisoners, whose terms of confinement expired on those days ; and it was 

 increased on the third and seventh day by two and two prisoners newly admitted 

 into the jail. The number of inoculated was reduced on the third day after inocu- 

 lation by four released prisoners. 



No information as to the subsequent history of these few released (uninoculated 

 and inoculated) prisoners reached the authorities or the officers of the Laboratory, 

 but the question had no interest for the experiment, since their conditions of life 

 and their exposure to plague ceased to be comparable from the time the prisoners 

 were discharged into a large city, with various chances of infection, different in its 

 different quarters. The observations referred only to the prisoners who remained 

 exposed to plague under the conditions of the jail. 



