The relations of general intelligence to certain mental and physical traits / Cyrus D. Mead.

  • Mead, Cyrus D. (Cyrus De Witt)
Date:
1916
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Licence: Public Domain Mark

Credit: The relations of general intelligence to certain mental and physical traits / Cyrus D. Mead. Source: Wellcome Collection.

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    is the crossing at age fourteen. From Fig. 11, high and low grade defective boys are distinctly apart at each age in height and weight. But with girls the curves cross at 14. Before this time (excepting 8 and 9 years in height) the lower grade girls are taller and heavier than the brighter girls; after age 14, the reverse is true. Can it be that high and low grade defective girls at about the fourteenth year reverse themselves in body growth? Again let it be understood that the condition is probably due to too few or exceptional cases. TABLE XII Girts’ Weigut—Pounps (Orpinary CLOTHING) a ET, Spa Grades C, D, Grades A and and E Total Defectives Normal B Moron Imbecile and Idiot Age |Cases} Aver- |Cases| Aver- | Cases} Aver- A. D.}| Cases} Aver- |A. D. bd 00 00 CRD OD RAT ROGET age age age age 6 9 | 47.94} 5. 7 17 | 51.29} 6. 8 1 52.00 4, 56.75 5 55.80} 9.0} 17 | 54.388] 6. 9 3 59.66 5 61.00 8 60.50) 7.2) 27 | 61.48{ 6. 10 2 60.00 5 73.20 7 69.43] 6.7] 22 | 67.14| 7 11 6 74.00 1 79.00 7 74.71; 10.8} 23 | 73.88) 13 12 “f 74.71 6 76.83} 13 75.69} 8.9} 19 | 88.41} 12 13 2 65.00 6 87.66 8 82.00] 13.7} 27 | 88.44] 9 14 13 99.00 4 99.00} 17 99.00} 13.0} 20 |103.13] 12 15 7 | 110.71 2 99.00 9 | 108.11] 17.0} 28 |107.87} 11. 16 11 | 120.09 3 98.00| 14 | 115.35} 17.6] 20 {117.00 11. 17 12 | 119.50 2 | 116.50) 14 | 119.07}; 12.6) 10 119.67} 10 18 6 | 121.18 5 | 121.80) 11 | 121.45) 12.8 4 |115.27| 8 19 5 | 1438.20 1 | 106.00 6 | 137.00) 24.0 2 1128.65} 8 20 10 | 120.00 3 90.66} 13 | 113.23} 18.5 21 3 | 113.66 1 98.00 4} 109.75) 11.2 22 2 {| 111.00 8) 21 111.00} 3.0 Sex DIFFERENCES Various studies with large groups of normal children have shown that from about eleven to fifteen years of age the girls were larger than boys in both height and weight. For example, Smedley (11, p. 1100); or MacDonald (6, p. 1023.) In order to see whether or not this condition reflected itself in measurements of mentally defective children, Fig. 14 was made
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