Karl Pearson 
95 
thus once in 100,000 trials two such divergent samples might be drawn. Although 
there is less divergence than in the case of T. hrucei and Nyasaland (6), it is idle 
to speak of such a degree of divergence as sameness. 
Length in Microns. 
i 
12 
13 
u 
15 
16 
17 
18 
10 
20 
31 
33 
33 
34 
35 
36 
37 
38 
39 
Mzimba (Donkey) (a) "... 
2 
14 
41 
91 
79 
56 
53 
38 
39 
22 
19 
16 
15 
9 
Human, Native Woman {h) 
1 
4 
19 
42 
63 
81 
75 
91 
65 
66 
93 
91 
107 
110 
104 
87 
Human, mixed (c) 
1 
4 
46 
111 
159 
219 
288 
312 
365 
359 
314 
314 
231 
218 
198 
T. hrucei 
5 
8 
14 
17 
40 
63 
55 
66 
63 
75 
87 
93 
80 
82 
72 
50 
38 
T. rhodesieiixe ... 
1 
3 
10 
19 
29 
35 
67 
54 
92 
51 
74 
56 
68 
59 
85 
61 
72 
50 
Length in Microns. — (continued). 
SO 
31 
32 
J4 
35 
SO 
37 
38 
39 
Totals 
Kemarks 
Mzimba (Donkey) («) 
2 
2 
2 
500 
R. S. Proc. Vol. 87, B, p. 31. 
Rats onlv. 
Human, Native Woman (b) 
49 
27 
23 
13 
7 
J 
1 
1220 
R. S. Proc. Vol. 85, B, p. 427. 
Various hosts. 
Human, mixed (c) 
132 
125 
90 
59 
30 
13 
8 
2 
2 
3600 
R. S. Proc. Vol. 86, B, p. 301. Read 
from diagram. Rats. 
7\ hrucei 
27 
26 
18 
11 
4 
4 
2 
1000 
R. S. Proc. Vol. 84, B, p. 331. 
Read from diagram 
T. rhodesiense 
52 
28 
13 
13 
5 
1 
1 
1 
1000 
R. S. Proc. Vol. 85, B, p. 227. 
Various hosts. 
To further establish our point let us compare the Human strain (c) for 3600 
trypanosomes with the T. rhodesiense. Here = 325'47 leading to P< '000,000,01. 
In other words the great degree of divergence for the case of the Nyasaland native 
woman is exceeded at least a thousand times, when we take the big example of 
four natives and one European. 
Sir David Bruce and his colleagues Avrite of these strains : 
"(1) The trypanosome of the human trypanosonie disease of Nyasaland is 
1\ rhodesiense (Stephens and Fantham)." In other words the P = "000,01 is inter- 
preted as sameness. 
"(2) This is a distinct species, nearly related to T. hrucei and T. gamhiense, 
but more closely resembling the former than the latter." In other words they at 
this date distinguished between T. hrucei and T. rhodesiense* , and as a result of 
this distinction proposed to call the human trypanosome disease of North-east 
Rhodesia and Nyasaland by the name "Kaodzera" as not being identical with the 
sleeping sickness of Uganda and the West Coast of Africa. If we, however^ 
compare T. hrucei and T. rhodesiense we find = 46-83 and P = -019. In other 
* R. S. Proc. Vol. 8.5, B, p. 433, 1912. 
