178 Trans. Acad. Sci. of St. Louis. 
TABLE NO. 16. 
The Weight of the Girl of Mean Precocity and the Girl of Mean Duliness.: 
PRECOCITY. DULLNESS. 
ge. Grades, Pounds. Pounds. Grades. Age. 
@253 70-8, LE... Lids ches ees cneet xe 46.96 44.68 Kn. .24 Eos acs casssvcs Z 
Oeas dy US FEE LV ee ens +°61.20° °49.62° Kn., .73 I... PEs es- 8 
Fo «BL TALE, TV ie eeee cs ceeds oe 56.25 54.82 IT, 49 Tl. cece wc cccccecs 9 
2Q <68: BIG LY 5 Vi Vib eves seus 61.34 59.44 I, II, .12 IlI.........-..10 
DD eee hs. VG Vis Villy scene 66.73 64.84 I, II, .78 III......++-++- 1l 
12.48 IV,V,VI,VII, VIII....... 74.59 71.72 I, Il, IIE, 521V..--.-++12 
18 .61 V,VI,VII, VIII, H.S.... 86.43 80.39 I, II, III, IV, .39 V.-..-- 13 
14 .69 VI,VII, VOI, H.S....... 96.61 92.00 II, III, IV, 31 VI.------ 14 
15. .55 VII, VII, H.S 104.54 100.03 II,III,IV,V,VI, .45 VII.-.15 
0 220 VIED, eS ica vciseet aces 113.31 108.39 IV,V,VI,VII, .80 VIII..16 
The meaning of these tables is shown graphically in Plate Il. 
Here are seen three pairs of curves. The uppermost are the 
curves of increase in weight of boys and girls of mean pre- 
cocity ; the lowermost, the curves of increase in weight of 
boys and girls of mean dullness. The middle curves give the 
mean weights irrespective of grade. In each pair the curve 
of girls’ weights is a broken line. 
Tables No. 2 and No. 3 support the view that mean weight 
irrespective of grade, or, in other words, mean weight irre- 
spective of success in school life, is also the mean weight of 
children of mediocre ability. If this view be correct, the 
curves of mean weight irrespective of grade may rightfully 
be compared with curves of weight of precocious and dull 
children, as has been done in Plate II. The fact that these 
curves of means irrespective of grade fall almost exactly be- 
tween the curves of precocity and dullness justifies this 
comparison. : 
Again, the mean weight at each age, on the basis of intelli- 
gence, i. e., the weight of the mediocre child, should be the 
same as the mean weight at each age irrespective of intelli- 
gence. The two preceding tables, No. 15 and No. 16, contain 
the mean weight of precocious and dull children. By adding 
these together at each age and dividing by 2, the weight of 
the mediocre child is secured. In Tables No. 17 and No. 18, 
these weights of mediocre children are compared with 
