age. The Boas figure for girls of age 15 to 16 is .57. This is 

 not so much larger than the figure we find, namely, .44. An 

 important factor to be considered in this comparison is the 

 fact that the coefficients submitted by Professor Boas are com- 

 puted uniformly on a small number of cases, and this accounts 

 in some measure for the differences in the two sets of figures. 

 It is also important to bear in mind that the coefficients of the 

 New York children correlate height in shoes with weight in 

 clothes. The heights, and presumably the weights, of the 

 Worcester children were taken without shoes. The effect of 

 this on the two sets of figures does not lend itself readily to 

 calculation. 



RELATION OF HEIGHT AND WEIGHT TO SCHOOL GRADE 



Students of the growth of school children have found that 

 there is a very high positive correlation between physical and 

 intellectual development. Attention was directed to this fact 

 especially by Porter in his study of St. Louis children. Confir- 

 mation was later given by Smedley for Chicago children, and 

 by Boas for Worcester children. These authors have pointed 

 out that in the advanced grades pupils are heavier and taller 

 than the pupils of the same age in the lower grades. Con- 

 versely, children who are retarded in grade are also retarded 

 in their physical measurements. Cramp ton, in his valuable 

 monograph on physiological age, presents data for New York 

 school children which clearly confirm these findings; his inter- 

 pretation, however, is somewhat different, since he emphasizes 

 pubescence as the determining factor which accounts not only 

 for the advance in school grade, but also for the physical 

 characteristics, such as height and weight. We are at present 

 not concerned with the complications involved in a consider- 

 ation of pubescence, since our material does not contain any 

 facts with reference to this condition. These findings add in- 

 terest, however, to the results obtained in our investigation. 

 The following table gives the number of boys and girls, and 

 their average height and weight in each of the school grades, 

 at the half-year periods. 



18 



