120 ROBERT BENNETT BEAN 



classes in England. It is generally recognized that the children 

 of the well-to-do grow more rapidly than the children of the 

 poor, that is, early in life. There may be some influence due to 

 the selected parentage and not alone due to environment. A 

 great number of the boys examined at Ann Arbor were chil- 

 dren of members of the Faculty of the University of Michigan, 

 or children of students, and this might have some influence. 



The German boys of Ann Arbor (324, Bean) are also taller than 

 the German boys of Boston (752, Bowditch), although this dif- 

 ference is only about 2 or 3 cm. until the age of 15 is reached 

 when both groups become equal in stature. This difference may 

 be due to environment alone because the Germans of Boston and 

 Ann Arbor probably come from a similar stock. 



The same difference that exists between the American boys of 

 Ann Arbor and of Boston exists to a hmited extent betwean the 

 girls of the two places. The girls of Ann Arbor (409, Bean) are 

 about 5 cm. taller at the age of 5 and 6 years than the Boston 

 girls (10,874, Bowditch) of the same age and this difference de- 

 creases until the age of 15 is reached, at which time the stature 

 is only about 2 cm. apart. The Ann Arbor girls pass the Ann 

 Arbor boys in stature a half year earlier than this takes place 

 in Boston (Ann Arbor, 10, Boston 10|) and the boys do not again 

 reach the stature of the girls in Ann Arbor until a half year later 

 than in Boston (Ann Arbor 15 years, Boston 14| years). 



Peckhan (44) reports the results of measuring 5,136 girls, and 

 5,117 boys of Milwaukee, in which the boys, both German boys 

 and American, were taller than the Boston boys from 13 years 

 onward (Bowditch 13,691 boys, 10,874 girls), with a rapid in- 

 crease of stature from 16 to 19 years. The girls at all ages both 

 German and American were taller than the Boston girls. The 

 Milwaukee children differ from the Ann Arbor children in that 

 the former have a late rapid growth whereas the latter have an 

 early rapid growth. Is the late rapid growth of the Milwaukee 

 children due to the Norse (long head) stock and is the early 

 rapid growth of the Ann Arbor children due to the large 

 south German (broad head) element? Or is it a matter of 

 environment? 



