222 Sir D. Bruce and others. Trypanosome 



Experiment 7, Monkey 1534, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of virus. 



o ui am ui 

 panosome. 



Period of 

 incubation, 

 in days. 



,. » 

 Uuration ot 



<>.J>(. ilM , ILL 



days, or 

 recovery. 



1912. 













Oct. 29... 



1534 



Prom Eat 1491 



Naturally infected 



6 



E. 









Dog 48 







1913. 













March 21... 



1534 



From Eat 1991 



Naturally infected 













Dog 48 







April 11 ... 



1534 



Prom Eat 2020 



Wild Q-. rnorsitans 



6 



17 



Remarks. — Monkey 1534, having recovered from Naturally Infected Dog Strain 48, and proved 

 to be immune to the same strain, succumbs in 17 days to the Wild &. rnorsitans strain. 



Conclusion. — The Naturally Infected Dog strain does not protect against the Wild Q. rnorsitans 

 strain. 



Experiment 8, Monkey 1630, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1912. 













Nov. 22 ... 



1630 



Prom Monkey 1534 



Naturally infected 



10 



E. 







Dog 48 







1913. 













March 21... 



1630 



From Eat 1991 



Naturally infected 













Dog 48 







April 11... 



1630 



From Guinea-pig 2034 



Wild Q-. rnorsitans 



13 



85 



Remarks. — Monkey 1630, having recovered from Naturally Infected Dog Strain 48, and shown 

 to be immune on re-injection, succumbs to the Wild O. rnorsitans strain. 



Conclusion. — The Naturally Infected Dog strain does not protect against the Wild &. rnorsitans 

 strain. 



Experiment 9, Goat 427, Naturally Infected Dog Strain. 



Date. 



1 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 

 recovery. 



1912. 













April 20... 



427 



Prom Eat 392 



Naturally infected 



10 



E. 







Dog 48 







1913. 













Jan. 22... 



427 



Prom Eat 1741 



Naturally infected 













Dog 48 







Feb. 11... 



427 



From Eat 1375 



Naturally infected 













Dog 48 







Feb. 28... 



427 



From Dog 1906 and 



Zululand, 1913 



38 



54 







Eat 1832 







Remarks. — G-oat 427 has recovered from Naturally Infected Dog Strain 48, and has shown no 

 reaction to two re-injections, but when inoculated with T. Inccei, Zululand, 1913, takes the 

 disease and dies in 54 days. 



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

 1913. 



