94 SPECIFICITY OF RICKETTSIA PROWAZEKI 



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

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

 The subsequent temperatures were as follows : 



F. F. 



June 28 102.8 July 8 104.1 



29 No record 



30 103.6 



July 1 103.6 



2 No record 



3 103.9 



" 4 No record 



5 104.1 



6 No record 



17. . 104.9 



9 No record 



10 104.1 



11 102.6 



12 101.7 



13 104.2 



14 104.4 



15 No record 



16 103.3 



17 . . 102.4 



July 17th; killed. The autopsy showed massive lesions of 

 pseudo-tuberculosis in the lymph nodes of the mesentery. 

 The spleen was moderately enlarged. As the tissues were lost, 

 there are no histological data. 



Result: At no time in the thirty-eight days following the 

 louse injection did this guinea-pig have a course of tempera- 

 ture consistent with typhus. A period of temperature followed 

 the test for immunity with typhus blood consistent with 

 typhus. 



Conclusion: Rickettsia-free louse 4 of Box xxxiv probably 

 did not contain the virus of typhus. 



