560 PROCEEDINGS OF SECTION G. 
The face expands in its two dimensions with great regu- 
larity. The width invariably exceeds the height, and for 
boys between the ages of 54 and 164 years the average 
excess 1s about 94 millimetres. From 54 years to 7 years 
the height shows little or no increase; from 7 years to 10 
years there is a regular increase amounting to 10 milli 
metres; from 10 years to 134 years the growth is extremely 
slow, probably averaging not more than 5 millimetres; 
from 135 to 16 years there is fairly regular growth; and 
after 164 years the face speedily attains its adult pro- 
portions. The expansion of the width follows much the 
same lines as the height. Compared with the breadth of 
the head the increase in the width of the face is very con- 
siderable. Thus, from 54 years to 16} years the transverse 
diameter of the head increases by 10 millimetres; during 
the same period the width of the face increases 22 milli- 
metres. The period of least growth in width of face is 
from 10 years to 134 years, when the growth is about 3 
millimetres. 
All European people show two different forms of 
head—a long and narrow, and a short and broad head. 
The long head is called the German type, as it prevails or 
formerly prevailed in that country. It is generally ad- 
mitted that amongst the Anglo-Celtic people long-headed- 
ness is an unfavourable sign, as the dullest boys show the 
largest percentage of this class of head. 
Amongst the boys examined it was found that— 
(a) Heads of the mesocephalic type—that is to say, 
whose index is 75 and less than 80—prevail at all 
ages, but are less numerous as age increases. 
(6) Short heads (brachycephaly) are far more common 
at all ages than long heads. They increase in 
number with age up to the period of puberty, 
and then decrease. 
(c) Long heads are more numerous as the age increases. 
The following are the proportions of each type at various 
periods per thousand boys :— 
Brachycephaly. Mesocephaly. | Dolichocephaly. 
Age Group. | Index 80 and | Index 75 and | Index under 
| over, under 80. 75. 
5 to 74d years. 354 609 37 
74tol0  ,, 371 598 31 
10 to123 ,,. | 416 546 38 
125 HOLD .65.85 | 370 573 a Yh 
15 10173 ,, 342 542 116 
