438 HALBERT L. DUNN 
percentage increment curve, however, is much higher than any 
other percentage increment based upon a straight-line measure- 
ment (with the single exception of the vermis cerebelli height, 
fig. 25, curve IV). 
TABLE 19 
Length of the vermis cerebelli 
Formula: Vermis cerebellilength (em.) = .01 [(crown-heel length (em.))!4! + 0.15] 
(124 cases) 
—_ vermis [OBSERVED AND| Op Cases 
Range Mean sees abyte Mean CeReeEEut MEANS 
em. cm, cm. cm. cm. cm. cm. 
Oto 5 
5 to 10 
LOOMS 27; 0.9 0.3 0.5 0.5 0.0 16 
15 to 20 16.9 deal 0.4 0.6 0.7 +0.1 14 
20 to 25 eRe 15) 14 0.6 0.9 1a +0.1 18 
25 to 30 27.0 1.8 0.9 1.15 ie2 +0.05 14 
30 to 35 32.8 az 1 eet J25 1.5) 0 16 
35 to 40 Ove: 2.6 1.3 1.8 1.8 0 18 
40 to 45 42.2 220) ed Pelt ral 0 i 
45 to 50 48.2 27 Peo eo Bay 0 8 
50 to 55 522 3.4 20 Bath 2.8 +0.1 8 
TABLE 20 
Calculated vermis cerebelli length at 5-cm. intervals of crown-heel length 
CROWN-HEEL LENGTH Mak ieee aera Se ene RATIO TO NEW-BORN 
cm, cm, cm. per cent per cent 
5 
10 0.41 15.5 
15 0.61 0.20 49.0 23.1 
20 0.83 0.22 36.1 31.5 
25 1.08 0.25 30.2 40.9 
30 1.36 0.28 25.9 51.6 
35 1.65 0.29 21.3 62.6 
40 1.96 0.31 18.8 74.3 
45 2.29 0.33 16.8 86.8 
50 2.64 0.35 15.3 100.0 
55 2.99 0.35 13.3 118.2 
