1923. No. 4. PHYSICAL DEVELOPMENT OF CHILDREN AND YOUNG PEOPLE. 



33 



under same; for the girls we find 54.5% under average weight, 50.2% 

 under average height. 



The much stronger extension of the weight curve toward the phis- 

 side appears quite natural to us, when we remember, that someone may 

 be found to weigh 100% more than the average, but impossibly loo'^t 

 below, — as H. J. Hansen emphasizes in his work. 



The variabilities in weight, statistically computed as standard devi- 

 ation and as coefficient of variability, are seen on table 4, the last one 

 graphically on curve, fig. 10. Already on page 2' we have mentioned, 

 how the weight varies much more than the height. A closer study of 

 the curves shows, how in the public school material, 7 — 14 years, the 



1C 11 12 1? H 15 to /: tS 1? 20i)eav3 



Fie. ro b. Hisfher schools. 



girls in all ages vary much stronger than the boys. The curves for the 

 higher schools teach us, that this stronger variability of the female sex 

 ceases at this latter age, 14 years, from which time the male sex varies 

 most strongly ^^. Concerning the curve sketch, which, as far as the higher 

 school is concerned, cannot be accurately detailed — as the probable error 

 is not altogetlier small — we refer to page 19. It is, however, conspicuous 

 how the time for the strongest variability of the girls (round about ij 

 years) falls earlier than that of the boys (about ifi). Cf. the practically 

 corresponding phenomena in regard to height, page 18, 19. The curves do 

 not furnish any proof for any difference in degree between the public 

 school and the higher school ; there seems to be considerable conformity 

 through the ages, that can be compared, viz. 9 to 14 years. 



** Anyway as far as our investigation reaches through the years. 

 Vid.-Selsk. Skrifter. I. M.-N. Kl. 1923. No. 4. 



