190 



Morphology of Various Strains of the Trypanosome causing 

 Disease in Man in Nyasaland : The Human Strain 

 (continued). — VI to X. 



By Surgeon-General Sir David Bruce, C.B., F.R.S., A.M.S. ; Major A. E. 

 Hamerton, D.S.O., and Captain D. P. Watson, Pt.A.M.C. ; and Lady 

 Bruce, B.R.C. (Scientific Commission of the Boyal Society, Nyasaland, 

 1912-14.) 



(Eeceived May 5,— Read June 25, 1914.) 

 Introduction. 



In a former paper* five strains of this species of trypanosome, obtained 

 from man, were described. In this it is intended to describe another set of 

 five. A small quantity of blood was taken from the sick native, brought up 

 to the laboratory, and inoculated into a monkey or white rat. 



Strains Vlf, VIII, and X were directly inoculated into the rat from which 

 the drawings and measurements were made ; in Strains VI and IX a single 

 monkey intervened. These five strains have therefore been obtained under 

 fairly similar circumstances, and should prove useful for purposes of 

 comparison. This is put in tabular form in Table I, and the history of the 

 previous five strains is also given, as this was omitted in the former paper. 

 It is possible that the type of a strain may be changed by passage through 

 different animals before it reaches the rat. 



Table I. — Showing the Passages through Animals between Man and the Eat 

 whose Trypanosomes are Drawn and Measured. 



Strain. 



Man. 



Monkey. 



Dog. 



Rat. 













II, E — - 



T 





2 



3 



Ill, Chituluka 



1 





2 



3 



IV, Chipochola 



1 





2 



3 



V, Chibibi 



1 





2 



3 



VI, Manakumpara ... 



1 



2 





:< 



VII, Yoraum 



1 







2 



VIII, Mekka 



1 







2 



IX, Mkanthama 



1 



2 





3 



X, Dongolosi 



1 







2 



Prom this table it will be seen that little time was lost in inoculating the 

 rat, the trypanosomes in whose blood were drawn and measured. 



* ' Eoy. Soc. Proc.,' B, vol. 86, p. 285 (1913). 



