432 HALBERT L. DUNN 
The linear measurement from the frontal to the occipital pole 
indicates therefore a steady absolute cerebral growth in the 
anteroposterior axis (when compared to crown-heel length) and 
a constant diminution of the rate of growth (when compared to 
time). 
TABLE 15 
Temporal diameter 
Formula: Temporal diameter (em.) = 0.138 crown-heel length (cm.) + 0.3 - 
(141 cases) 
Borers pare | Oe 
pe || SY OMPORAL J'OBEERVED AND On GAanS 
Range Mean Maxi- Mini- Mean ear ¢ peas 
mum mum 
cm. cm. cm. cm. cm. cm. cm. 
Oto 5 3.9 1.0 0.7 0.85 0.85 0 4 
5 to 10 Se) 250 ibs 1.45 1.4 —0.03 7 
10 to 15 12.4] 3.5 11'5 pal 2.0 —0.1 19 
15 to 20 16.6 3.4 1.8 2.6 2.6 0 15 
20 to 25 2246, | “422 2.6 3.3 3.4 +0.1 21 
25 to 30 27.0 4.6 3.2 4.1 4.0 —0.1 15 
30 to 35 32.6 | 5.0 3.8 4.5 4.8 +0.3 16 
35 to 40 Ofelia) (628 4.6 5.5 5.4 —0.1 18 
40 to 45 42.3 | 6.7 5.6 6.2 6.1 —0.1 11 
45 to 50 48.2 7.2 6.6 Ged 6.95 +0.25 8 
50 to 55 52.2 | 10.4 6.9 7.9 C5 —0.4 of 
TABLE 16 
Calculated temporal diameter at 5-cm. intervals of crown-heel length 
INCREMENT IN EACH 
CROWN-HEEL LENGTH TEMPORAL DIAMETER 5-CM. INTERVAL 
VL 
RATIO TO NEW-BORN 
em, cm, cm. per cent per cent 
5 0.99 13.7 
10 1.68 0.69 69.7 23.4 
15 2.37 0.69 41.1 32.9 
20 3.06 0.69 29.1 42.6 
25 3.75 0.69 22.5 52.1 
30 4,44 0.69 18.4 61.6 
30 5.13 0.69 15.5 71.3 
40 5.82 0.69 13.4 81.0 
45 6.51 0.69 11.8 90.4 
50 7.20 0.69 10.6 100.0 
50 7.89 0.69 YEG 109.5 
