Trans. Acad. Sci. of St. 
Louis. 
AGE: 6 *f 8 9 10 11 12 13 14 15 16 iB 18 
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VOL. VI. No. 10, PLATE I (from Tables No. 4 and 5). 
Black: Relative Probable Deviation 
d 
Red: Relative Annual Increase of Average. 
Unbroken Curves: Boys. 
Broken Curves: Girls. 
