PROTOCOLS OF EXPERIMENTS 91 



The results are inconclusive in that the failure to develop 

 typhus following the injection of human blood is compatible 

 with the common experiences with normal guinea-pigs and is 

 not definite proof of immunity. 



Conclusion: Rickettsia-free louse 1 of Box xxxiv probably 

 did not contain the virus of typhus. 



Record of Guinea-pig 37, inoculated with the viscera of 

 louse 2 of Box XXXIV 



Temperatures following the inoculation on May 22d : 



F. F. 



May 22 No record June 10 102.0 



23 102.6 11 101.2 



24 102.2 12 101.4 



25 103.0 " 13 102.0 



26 103.4 14 103.4 



27 102.0 15 103.0 



28 102.8 " 16 102.6 



29 103.0 17 No record 



30 102.6 18 103.4 



31 102.0 19 103.0 



June 1 103.0 " 20 No record 



2 102.0 21 103.0 



3 103.2 22 No record 



4 101.6 23 102.7 



5 102.3 " 24 No record 



6 102.2 tt 25 102.8 



7 102.6 u 26 No record 



8 102.0 " 27 102.2 



9 101.8 



On June 28th this guinea-pig was inoculated intraperitone- 

 ally with 5 c.c. of blood from patient 814 (eighth day of typhus) 

 and the subsequent temperatures were as follows: 



June 28 . . 102.5 July 8 102.1 



29 No record 



30 102.4 



Juy 1 101.6 



2 No record 



3 105.1 



4 103.1 



5 103.4 



6 No record 



7 . . 103.1 



9 No record 



10 102.3 



11 102.2 



12 103.1 



13 102.7 



14 106.0 



15 No record 



16 105.2 



17 . . 104.5 



