i 
I 
Karl Pearson 137 
In order to determine how far heterogeneity of treatment or material might be 
responsible we took further frequencies. In the first place we dealt with the 3600 
measurements for trj'panosomes through the rat only. The frequencies are : 
15 
IG 
17 
18 
19 
20 
21 
22 
23 
25 
26 
27 
28 
29 
30 
31 
32 
33 
3J, 
,?5 
36 
57 
Totals 
1 
5 
47 
112 
161 
216 
290 
316 
376 
362 
322 
294 
235 
219 
210 
134 
108 
88 
57 
28 
9 
8 
1 
1 
3600 
400 
