224 Sir D. Bruce and others. Trypanosome 



Experiment 3 3, Monkey 1794, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of -virus. 



otram ot 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1913. 













Jan. 22 ... 



1794 



Irom Eat 1741 



Naturally infected 













Dog 48 







Feb. 28 ... 



1794 



From Eat 1945 



Naturally infected 













Dog 48 







May 23 ... 



1794 



From Monkey 2131 



Naturally infected 













Dog 48 







June 11 ... 



1794 



From Monkey 2184 



Naturally infected 











Dog 48 







„ 24 ... 



1794 



From Guinea-pig 



Zululand, 1913 



9 



42 



Remarks. — Monkey 1794 has been proved to be immune to Naturally Infected Dog Strain 48, 

 but when exposed to the Zululand strain succumbs. 



Conclusion. — Immunity to the Naturally Infected dog strain does not imply immunity to 

 T. brucei, Zululand, 1913. 



Experiment 14, Monkey 1798, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1913. 













Jan. 22 ... 



1798 



From Monkey 1630 



Naturally infected 











Dog 48 







Feb. 28 ... 



1798 



From Eat 1945 



Naturally infected 













Dog 48 







May 22 ... 



1798 



From Monkey 2131 



Naturally infected 











Dog 48 







June 11 ... 



1798 



From Monkey 2184 



Naturally infected 











Dog 48 







June 24 ... 



1798 



From Guinea-pig 2225 



Zululand, 1913 



9 



15 



Remarks. — Monkey 1798 has been proved to be immune to Naturally Infected Dog Strain 48, 



but succumbs to T. brucei, Zululand, 1913. 



Conclusions. — The Naturally Infected Dog strain does not protect against T. brucei, Zululand, 

 1913. 



