PROTECTIVE INOCULATION. 

 Series V. — Infection by inhalation. 



241 



Vaccinated monkeys. • 



Normal monkeys. ■> 



No. 5818 died In 5 days. 



No. 5854 died in 2 days. 



No. 5819 died in 6 days. 



No. 5855 diad in f, days. 



No. 5820 diet! in 5 dayB. 



No. 585C died in r> days. 



No. 6822 survived. 



No. 5887 died in 7 days. 



No. 5823 died in 6 days. 



No. 6858 died in 5 days. 



No. 5824 died in 2 days. 



No. 5859 died in 6 days. 



No. 5825 died in 6 days. 



No. r,860 died in 5 days. 



No. 6826 died in 6 days. 



No. 6861 died in 5 days. 



No. 5827 died in 6 days. 



No. 5862 died in 5 days. 



No. 5828 died in 5 days. 



No. 5863 died in 5 days. 



No. 5829 died in 5 days. 



No. 5864 died in 6 days. 



No. 5830 died in 5 days. 



No. 5865 died in 5 days. 



No. 5831 died in 5 days. 



No. 5866 died in 2 days. 



No. 5832 died in 2 days. 



No. 5867 died in 5 days. 



No. 5833 died in 9 days. 



No. 5868 died in 2 days. 



No. 5834 survived. 



No. 5869 died in 5 days. 



No. 5835 died in 6 days. 



No. 5870 died in 2 days. 



No. 5837 died in 5 days. 



No. 5871 died in 5 days. 



No. 5838 died in 4 days. 



No. 5872 died in 5 days. 



No. 5839 died in 5 days. 



No. 5873 died in 5 days. 



No. 5840 died in 6 days. 



No. 6874 died in 5 days. 



« Total : Survived, 2 ; died, 19. 

 b Total : Survived, ; died, 21. 



Only 2, or 9.5 per cent, of the vaccinated animals survived, 

 while all of the control monkeys died of pneumonic-plague 

 infection. 



Summary of all experiments upon monkeys. 



Series. 



Vaccinated monkeys. ! Normal monkeys. 



Survived. 



Died. 



Percent- 

 age of 

 survivals. 



Survived. 



Died. 



1 

 Percent- 

 asre of 

 survivals. 



IV 



9 

 2 



1 



13 

 19 



41 

 9.5 



4 

 

 



18 

 21 

 12 



18 

 

 



V 



Ill 



10 9 









Total 



12 ! 42 



i 



22 4 j 51 



7.3 



As w^e have done in the case of the unvaccinated guinea pigs, 

 so it will be advisable in the case of the unvaccinated normal 

 monkeys to examine into the character of the infection. The 

 following observations apply to practically all of these control 

 animals. At necropsy, there was absence of any sign of plague 

 infection about the tissues of the neck. The submaxillary and 

 cervical IjTnphatic glands and those about the trachea were 



105936 8 



