PROTOCOLS OF EXPERIMENTS 



93 



. 



June 28 103.0 



" 29 No record 



" 30 102.6 



July 1 103.0 



" 2 No record 



3 104.7 



4 103.8 



" 5 103.2 



" 6 No record 



* 7 . . 102.7 



July 



. 



8 .......... 102.1 



9 . .No record 



10 

 11 

 12 

 13 

 14 



102.6 

 102.8 

 102.4 

 102.3 

 104.4 



15 No record 



16 104.0 



17 . . 103.8 



July 18th; killed. The autopsy showed an enlarged spleen 

 covered with a thin transparent fibrin-like layer. The mesenteric 

 lymph nodes were enlarged and caseous (pseudo-tuberculosis). 



Result: In view of the pseudo-tuberculosis found at autopsy, 

 it is evident that the irregular elevations of temperature dur- 

 ing the thirty-eight days of observation after the louse injec- 

 tion were not due to typhus. On the other hand, the onset 

 of temperature sixteen days after the injection of human typhus 

 blood is consistent with typhus. 



Conclusion: Rickettsia-free louse 3 of Box xxxiv did not 

 contain the virus of typhus. 



Record of Guinea-pig 39, inoculated with louse 4 of Box XXXIV 

 Temperatures following the inoculation on May 22d: 



May 22 ............ No record 



June 



23 

 24 

 25 

 26 



27 



28 



29 



30 



31 



1 



2 



3 



4 



5 



6 



7 



104.0 

 102.9 

 104.0 

 104.1 

 103.2 

 102.2 

 102.8 

 102.7 

 102.2 

 103.2 

 103.0 

 101.9 

 102.0 

 102.0 

 101.8 

 103.2 

 103.0 

 102.8 



June 10 102.8 



11 103.0 



12 102.4 



13 102.8 



14 103.6 



15 102.8 



16 102.9 



17 103.8 



18 104.2 



19 103.2 



20 No record 



21 103.3 



22 No record 



23 102.7 



24 No record 



25 102.4 



26 No record 



27 . . 103.0 



