1923- NO- 4- PHYSICAL DEVELOPMENT OF CHILDREN AND YOUNG PEOPLE. 35 



girl curve, 12 -* to 14, and that of the boy curve, 14 to 16, with for both 

 sexes the strongest oscillation during the last year of the term fan in- 

 crease in iveight of about 

 12 ^ Oj. After this there is 

 a decided falling off in the 

 weight increase. At 17V2 

 it is down to 2^0 for 

 the girls (cfr. the height, 

 page 20. after 15 2^0), 

 at 18 '2^0. For the boys 

 it is at 20 down to 2 ^/0 

 (height 2^0 after 17). 



II. 



9. 



S. 



Fig. 1 1 a. Public schools. 



M<r • 11 • 12 - 15 - H - 15 - i:- - ): - I> - 19 -ÎC ij^arä 

 Fis. lib. Hiffher schools. 



Bodily weight at the Public Schools in the different part of the city. 



A comparative study of all the public schools is of considerable 

 interest: it will principally furnish information about the important 

 problem, the influence of the surroundings. The difficulty will be to 

 find a method, which gives a single numeric expression for the level of 

 each school. Simply to calculate the average at each school would, of 

 course, give an unusable result, as the distribution of age and sex is 

 not precisely the same everywhere. It would be better to compute, 



1) the average weight for each year class, separatedly for the sexes; 



2) the average number of this, likewise separated for the sexes: and 



3) the average of the average of boys and girls. Hereby would be 

 obtained for most of the schools a rather characteristic number: but in 

 such case the schools for the feeble-minded and delinquents should be 

 taken out, they have few or no representatives in the younger year 

 classes, and yet, these schools should not be left out. Another method 

 is therefore selected, which gives an illustrative, collective survey over 

 the question: 



" By "12'' is of course meant the increase in weight from 11 to 12. 



