PROTOCOLS OF EXPERIMENTS 55 



The spleen was enlarged. A caseous lymph node of healed 

 pseudo-tuberculosis was found. No other lesions. 



Result: Guinea-pig 11 failed to react, after inoculation with 

 the viscera of louse W 236, during an observation period of 

 thirty-eight days. It then proved susceptible to an injection of 

 blood from a typhus patient. 



Conclusion: Louse W 236 did not contain the virus of typhus. 



Record of Guinea-pig 17, inoculated with rickettsia-free 

 louse W 237 



From May 15th to June 22d the temperature of this guinea- 

 pig remained normal. On June 22d it received intraperitoneally 

 5 c.c. of blood from patient 799. The temperatures subsequent 

 to this inoculation were as follows: 



F. F. 



June 22 .......... No record July 6 .......... No record 



" 23 . . 103.2 * 7 . . 104.4 



24 No record 



25 102.0 



26 No record 



27 102.0 



28 No record 



29 . . 103.1 



105.0 



9 No record 



10 103.4 



11 102.1 



12 102.6 



13 . . 101.8 



30 102.1 14 102.8 



July 1 103.4 " 15 No record 



2 No record : 16 102.2 



3 104.7 17 102.6 



4 106.8 18 Killed 



5 106.0 



No gross lesions were found. 



Result: Guinea-pig 17 failed to react, after inoculation with 

 the viscera of louse W 237, during an observation period of 

 thirty-eight days. It proved susceptible to an injection of 

 blood from a typhus patient. 



Conclusion: Louse W 237 did not contain the virus of typhus. 



