430 HALBERT L. DUNN 
The absolute fronto-occipital diameter (fig. 8) when plotted to 
the crown-heel length is a straight line ascending from 2 cm. at 
10 cm. (C H) to 9 em. at 50 em. (C H). Its empirical formula is: 
Fronto-occipital diameter (em.) = 0.175 CH body length (cm.) 
+ 0.25 
TABLE 13 
Fronto-occipital diameter 
Formula: Fronto-occipital diameter (em.) = .175 crown-heel length (em.) + .25 
(151 cases) 
cnowienmsniaans |  Gmennyan rnow7e:, | cazconamen | PHERRENR | 
ip, EET eee ee eee OCCIPITAL ee ae OF CASES 
Range Mean naa secre Mean AES MEANS 
cm. cm. cm. cm. cm. cm. cm. 
Oto 5 4.0 ibaa ORG 0.9 0.9 0 3 
5 to 10 Cell 2.0 1.2 1.6 os —0.1 10 
10 to 15 12.3 Deel. 1.4 2.3 2.4 +0.1 21 
15 to 20 16.7 She 38) ae) Oo. 0 15 
20 to 25 22.6 4.9 3.6 4.3 4.2 —0.1 21 
25 to 30 27.0 6.5 4.4 Sol 5.0 —0.1 16 
30 to 35 32.6 GOO) Sone 6.0 6.0 0 19 
35 to 40 BYfoll Oth || ea 6.8 6.7 —0.1 19 
40 to 45 42.3 8.4 bo 7.8 7.6 —0.2 11 
45 to 50 48.2 9.3 hold) 8.6 8.7 +0.1 8 
50 to 55 52.2 10.0 8.0 9.2 9.4 +0.2 8 
TABLE 14 
Calculated fronto-occipital diameter at 5-cm. intervals of crown-heel length 
CROWN-HEEL LENGTH | eT eee hi are ea RATIO TO NEW-BORN 
cm. cm, cm. per cent per cent 
5 1.125 12.5 
10 2.000 0.875 78.0 222 
15 2.875 0.875 43.7 31.9 
20 3.750 0.875 30.3 41.6 
25 4.625 0.875 23.3 51.4 
30 5.500 0.875 18.9 61.1 
35 6.375 0.875 15.9 70.8 
40 7.250 0.875 13.6 80.5 
45 8.125 0.875 12.1 90.3 
50 9.000 0.875 10.8 100.0 
55 9.875 0.875 9.7 109.8 
