Karl Pearson 
535 
We find : r = 16'5111, = - 9-9138 (since is positive), 
a = -52743, 7/„ = 8G38-6, 
and the distribution of the 40,000 indices possible is given by : 
F= 8638-6 1 
X- \-9-'255(; 9-9138 tail- 
-27818 
A' 
■52743 
•(1), 
where Y is the frequency at distance X from the origin of the curve v/hich is at 
the opsonic index "6949, the unit of X being absolute opsonic index measurement. 
19 -6 -7 -8 -9 1-0 M 1.2 1-3 
Ojjsonic Index. 
Diagram I. Samples of 100 counted. 
