88 SPECIFICITY OF RICKETTSIA PROWAZEKI 



Result: The initial temperatures of this guinea-pig corre- 

 sponded to those of number 33 and in the light of the autopsy 

 were probably due to pseudo-tuberculosis. The reaction to 

 human blood after an incubation period of thirteen days was 

 characteristic of typhus and proof that the animal was not 

 immune as a result of the louse injection. 



Conclusion: Louse 3 of Box xxvm did not contain the virus 

 of typhus. 



Record of Guinea-pig 35, inoculated with the viscera of 

 louse 4 of Box XXVIII 



The temperatures following the inoculation on May 19th 

 were as follows: 



F. P. 



May 19 100.3 May 24 104.3 



20 103.4 25 104.1 



21 105.0 u 26 104.0 



22 104.4 27 Dead 



23 103.3 



The autopsy showed active pseudo-tuberculosis. 



Result: Valueless. The course of this guinea-pig parallels 

 those of numbers 33 and 34, and illustrates the behavior of 

 the epizootic then prevailing in our stock animals. 



