344 
On Linearity of B egression 
Illustration G. On the Skew Correlation between Size of Cell and Size of 
Body in Daplinia magna. 
Length of body is taken for the a;-character and size of cell for the ?/-character. 
We have 
p 
Xp 
1 
20 
5 -3000 
0-9092 
2 
150 
5-8333 
1-6620 
3 
100 
7-7900 
1 -6860 
k 
80 
8-0500 
2-1539 
5 
150 
9-4733 
2-6694 
6 
140 
8-4357 
1-7087 
7 
230 
8-5957 
1-9384 
8 
120 
10-2667 
1-9439 
0 
180 
10-7611 
2-4469 
10 
150 
11-0267 
2-6949 
11 
150 
10-9533 
2-4470 
12 
140 
9-1000 
1-7947 
13 
120 
9-0000 
1-8619 
U 
220 
10-0364 
1-8894 
15 
60 
10-3167 
1-5165 
We find, using Sheppard's corrections for the cell sizes, but not for the body 
lengths, 
i\^= 2010, 
y 
X = 8-5025, 
o-^ = 3-8648, 
z', = 14-9366, 
V, =432-7695, 
av= = X, = 2-1136, 
\4 = 15-1375, 
\y,= 27-8071, 
X„o= 56-3594, 
cr,, = 1-4538, 7? = 
%: = -8918, 
Siibstituting in formula (xxii) we get 
Uy ■ 
p.. 
9-2687, 
2- 5417, 
6-4604. 
3- 8929, 
127-3503, 
108-1612. 
■5720, 
r = -3963, 
= -7574. 
= {3-3108 - -2651 + -8098 - 1-2303 
+ -0971 --3796 --6074 
+ •77521 
= ^{3-3108 --6855 
This gives 
Pearson gives 
Hence 
= ^(3-3108- 
1^ = -0353, 
-8898 + -7752} 
•8001} = (2-5106} (xxxiv). 
= -0238. 
E„ =-0097. 
2„ = -0144. 
