causing Disease in Man in Nyasaland. 225 



Experiment 15, Monkey 2161, Naturally Infected Dog Strain. 



Date. 



Expt. 



Source of virus. 



otrain or 

 trypanosome. 



Period of 

 incubation, 

 in days. 



TV • C 



.Duration ol 

 disease, in 

 days or 

 recovery. 



1913. 













May 14 ... 



2161 



From Eat 2091 



Naturally infected 











Dog 2033 







June 14 ... 



2161 



From Dog 2157 



Naturally infected 











Dog 2033 







July 31 ... 



2161 



From Eat 2285 



Naturally infected 













Dog 48 







Dec. 17 ... 



2161 



From Eat 2451 



Zululand, 1913 



7 



Alive 1.3.14 









Remarks. — Monkey 2161, proved to be immune to Naturally Infected Dog Strains 2033 and 48, 

 shows no immunity to T. Irucei, Zululand, 1913. 



Experiment 16, Goat 639, Wild G. morsitans Strain. 



Date. 



Expt. 



Source of virus. 



Strain of 

 trypanosome. 



Period of 

 incubation, 

 in days. 



Duration of 

 disease, in 

 days, or 











recovery. 



1912. 













June 12 ... 



639 



From Eat 543 



Wild G. morsitans 



12 



E. 



1913. 





Jan. 22 ... 



639 



From Eat 1741 



Naturally infected 



Dog 48 

 Naturally infected 



Dog 48 

 Zululand, 1913 













Feb. 11 ... 



639 



From Eat 1735 







Feb. 28 ... 



639 



From Dog 1906 and 

 Eat 1832 



10 



48 



Remarks. — Goat 639 has recovered from the Wild G. morsitans strain, has shown no reaction 

 when inoculated with Naturally Infected Dog Strain 48, but is killed in 48 days by T. brucei 

 Zululand, 1913. 



Conclusion. — The Wild G. morsitans strain, combined with the Naturally Infected Dog strain, 

 has no protective power against T. Irucei, Zululand, 1913. 



