PROTOCOLS OF EXPERIMENTS 79 



F. F. 



June 11 105.0 June 17 No record 



12 103.6 " 18 104.0 



13 103.8 " 19 103.6 



" 14 104.6 20 No record 



15 103.2 21 103.6 



" 16 104.2 



On June 22d this guinea-pig was inoculated intraperitoneally 

 with 3 c.c. of blood from patient 799 (eighth day of disease). 

 Subsequent temperatures were as follows: 



F. F. 



June 22 No record July 4 105.4 



23 104.0 



24 No record 



" 25 No record 



26 No record 



27 104.0 



28 104.1 



29 No record 



30 103.3 



July 1 104.7 



5 105.2 



6 No record 



7 104.7 



8 105.2 



9 No record 



10 103.8 



11 103.4 



12 102.7 



13 . . 102.4 



2 No record " 14 102.3 



3 105.0 15 Dead 



Result: During an observation period of thirty-seven days 

 following the inoculation with louse W 264, guinea-pig 28 ran 

 an irregular temperature, not typical and perhaps inconsistent 

 with typhus. Following inoculation with typhus blood it be- 

 haved in a manner typical of guinea-pigs with typhus com- 

 plicated with a secondary infection, thereby demonstrating 

 lack of immunity. 



Conclusion: Rickettsia-free louse W 264 did not contain the 

 virus of typhus. 



