126 Biometric Constants of English Brain-weights 
(3) On the Means and Variabilities of the Anthmpometric Characters of the 
Present Material. 
Table II. contains the means, standard deviations, and coefficients of variation 
of all the characters dealt with. 
We notice that the woman is absolutely more variable than man in four out of 
the nine characters considered, and relatively more variable in eight out of the nine. 
In the ninth, stature, the difference in variability between the two sexes is well 
within the probable error of the difference. This is a further illustration of the 
point that man is not essentially more vai'iable than woman. 
We can now make some comparisons between this general hospital population 
and other English groups. In the first place let us take the head-measurements : 
TABLE II. Means and Variabilities. 
Character 
Mean 
Standard Deviation 
Coefficient of Variation 
? 
? 
6 
? 
Head Length 
(Z) in mm. 
190-3G 
± -35 
183-20 
± -39 
5-62 
±-25 
5-59 
±-28 
2-95 
±-13 
3-05 
± -15 
Head Breadth ... 
(B) in mm. 
149-34 
± -34 
144-55 
± -40 
5-41 
± -24 
5-76 
± -28 
3-62 
± -16 
3-99 
± -20 
Auricular Height 
(H) in mm. 
loi yu 
±•28 
izy zi 
± -30 
4 Oi 
± -20 
A 'QC^ 
4 
±•21 
±-15 
±-17 
Cephalic Index ... 
(100j5/Z) 
78-48 
±-17 
78-93 
± -20 
2-76 
±•12 
2-87 
±•14 
3-52 
±•16 
3-64 
±-18 
Horizontal Cir- 
cumference . . . 
(^7) in mm. 
555-79 
± -99 
533-25 
±1-17 
15-84 
±-70 
16-83 
±•83 
2-85 
±-13 
3-16 
±-16 
Product 
(P=Ly.BxH) in 
cm.'* 
3782-91 
±18-11 
3427-03 
±19-68 
290-47 
±12-81 
282-94 
±13^92 
7-68 
± -34 
8-26 
±-41 
Stature 
((S^) in inches 
67-16 
±-19 
63-05 
±•19 
3-05 
±-13 
2^79 
±•14 
4-55 
± -20 
4-42 
± -22 
Age 
{A) in year.s 
49-26 
±■76 
45-90 
± -95 
12-11 
± -53 
13^69 
±•67 
24-60 
±1-15 
29-83 
±1-59 
Brain- Weight ... 
(«') in grs. 
1327-69 
±6-49 
1224-90 
±6-70 
104-03 
±4-59 
100^16 
±4-93 
7-84 
± -35 
8-18 
±•40 
N.B. In worliing out all further biometric constants, regression formulae, etc., not the 
above values but the values as actually calculated to four decimal places were used. 
