Eveline Y. Thomson 
TABLE VI. Measurements from Sagittal Type Contours. 
129 
Male 
Female 
Character 
By Cranial Average 
By Type Contour 
By Cranial Average 
By Type Contour 
LB ... 
G'H ... 
GB ... 
fml . . . 
Ocl ... 
F 
/' 
H 
182-0 
185-6 
135-9 
105-6 
76-4 
103-2 
35-3 
62-2 
21-6 
64°-9 
7r-8 
43°-4 
84°-7 
182-2 
185-6 
135-4 
106-0 
77-0 
101-0 
37-2 
62-1 
19-4 
64°-8 
7r-9 
43°-2 
88°-0 
176- 1 
177- 8 
132-8 
102-3 
70-0 
96-6 
34-4 
64-2 
21-9 
65°-7 
73°-6 
40°-7 
84°-5 
175-8 
178-2 
131-4 
101-5 
71-1 
97-5 
38-5 
64-2 
211 
66°-3 
72°-2 
4r-5 
86°-8 
Frontal Index 
NL ... 
Al ... 
Bl ... 
PL ... 
draughtsman's error) in the female. I take it that in the measurement of the 
foramen with the dividers the tendency is to measure the inside border of the 
foramen, but with the Klaatsch contour tracer to stop just short of the edge. It 
seems to me reasonable to suppose that if the basion and opisthion were first 
marked off as points and the foraminal length then compared with actual measure- 
ment, we should insure not only the exactitude of the foraminal length, but of 
the occipital arc. 
(ii) The profile angle. Here the difJerence is 3°-3 in the males and 2°-3 in 
the females ; this is serious. I take it to arise from a divergence in the deter- 
mination of the alveolar point (i) with the sagittal contour vertical and using the 
goniometer, and (ii) with the sagittal contour horizontal and using the Klaatsch. 
But I must reserve the discussion of the point until further experiments have 
been made. The fundamental triangles are in quite good accordance, and 
accordingly the evil may lie in the determination of the auricular point, when 
the skull is off the craniophor. We note how closely the occipital indices 
deduced from the contours approach those obtained from the measurement of 
occipital arc and chord. Indices from the contours were taken as i = occipital 
subtense/occipital chord. Then if / be the occipital index as defined by 
it is easy to deduce that 
Biometrika xi 
9 
