138 
Biometric Constants of English Bram-weights 
on the head, Our results therefore must at present stand unsupported. They 
show a sensible shrinkage of the head diameters, greater in the woman and 
greatest in the auricular height for both sexes. The amount of it is represented 
graphically in Fig. 2. The equations to the regression lines are as follows, age 
being measured in years and the diameters in centimetres : 
Maximum Head Length, Males : L = - -0348^ + 192-07, 
Females: Z = - -06234 + 186-06, 
Maximum Head Breadth, Males : B = - -04064 + 151-34, 
Females: 5 = - 08674 + 148-53, 
Auricular Height, Males : H = - 0799A + 136 84, 
Females: ir= - -10594 + 134 07. 
Fig. 2. 
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so 10 «o 4<3 ao &o oa 70 

It will thus be seen that the woman shrinks with age about twice as fast as the 
man in head length and breadth, but only about | as fast in auricular height. 
The very sensible shrinkage for both sexes in head height is peculiarly noteworthy, 
as it of course contributes to the shrinkage in stature. It seemed worth while 
investigating whether these results are peculiar to a hospital population. 
Accordingly 1306 criminals were taken, whose age, head length and head breadth 
but (unfortunately) not head height were recorded, and the correlations worked 
out for age and these two diameters. The correlation tables are given as 
