144 On the Inheritance of the Mental and Moral Characters in Man 
and boys with breadth of head above 145 mm. For example, here is a simple 
classification of 2022 pairs of brothers by this process : — 
Breadth of Head. 
First Brother. 
Below 
Above 145 
Totals 
Below 1^5 ... 
635-5 
307 
942-5 
Above H5 . . . 
307 
772-5 
1079-5 
Totals 
942-5 
1079-5 
2022 
The result is precisely the same as dividing this ring model (exhibited at the lecture) 
by a pair of rectangular planes and counting up the number of rings in each of 
the four spaces. 
DiAGBAM VIII. Distribution of Head Breadths in 3000 Criminals. 
\ 
f 
— 
— If 
-4 
I 
4 
4 
4 
1 
1 
\\\ 
\\ 
no mo 
Head Breadth in vims. 
Normal curve given by continuous line. 
