1923. No. 4. PHYSICAL DEVELOPMENT OF CHILDREN AND YOLNG PEOPLE. 47 



rV. Periods of development and puberty. 



We have referred to the obvious inclines in energy of development, 

 u.'hich could be verified for the girls averagely after ii years, for boys 

 after ij years, in regard to height and weight. These inclines, which at 

 this time or about this time are found in all research works of school 



children, have been attributed to the puberty that now approaches, a 

 couple of years earlier for the girls than for the boys. There is no doubt 

 whatever, but that this is correct. We can further refer to a statistical 

 research by Alette Schreiner and the author of the ages 12 — 17 

 in two higher schools in Christiania. The research refers to height, 

 weight and development of puberty. 



In order to avoid every confusion on the terminolog)" — such do 

 exist in literature — we beg to observe what follows: "Puberty" should 



