The GroiMli of St. Louis CJdldren. 



63 



Far different is the development of weiglit and strength of 

 squeeze. These increase much more rai)idly than height, for 

 at age 6 the heiglit stands to weight in the ratio of 100 to 18, 

 and to strength of squeeze as 100 to 6, while at age 16 tliese 

 ratios are 100 to 34 and 100 to about 16, respectively. The 

 parallelism in the development of weight and strength of 

 squeeze is interesting. The dimensious of the liead and face 

 increase somewhat less rapidly than the height. 



In Volume VI, No. 7, of the Transactions of the Academy 

 of Science of St. Louis, issued March 21, 1803, I demou- 

 strated that children who possess more than the ordinary 

 power of mental labor, as measured by their progress in their 

 studies, are heavier, taller, and larger in girth of chest and in 

 width of head than their less gifted companions of the same 

 acje. A more extended statement of these observations was 

 presented to the Berliner Gesellschaft fiir Anthropologic, 

 Ethnologic, und Urgeschichte, July 15, 1893, and appears in 

 Virchoivs Zeitsclirift fur Etlinolorfie., under the title ''Unter- 

 suchungen der Schulkinder in Bezug auf die physischen 

 Grundlagen ihrer geistigen Entwickelung." In these papers 

 the material was the total number of observations irrespective 

 of the social condition of parents. An example, selected 

 from Tables Nos. 2 and 4, pages 165 and 167, of The Phys- 

 ical Basis of Precocity and Dullness., will illustrate the result 

 of the enquiry. Pupils aged 11 are found in Grades I, II, III, 

 IV, V, and VI of the St. Louis Public Schools, as the follow- 

 ing table shows. The 59 boys of Grade I, the lowest grade, 



Table Showing Median AVeight of Boys Aged 11 Distkibuted by School Gkade. 



