THE GROWTH OF THE BRAIN. 



extend beyond the seventeenth, the period in any in- 

 dividual is usually much shorter. Thus any such growth 

 change which is common to all individuals, yet variable 



CHART I. ANNUAL INCREASE IN WEIGHT IN BOVS . 



CHART E, ANNUAL INCREASE IN WEIGHT JN GIRLS. 



FlG. 10. Charts i and 2, showing annual absolute in- 

 crease in weight in boys and girls. Based on observa- 

 tions by Bowditch - , and those by Roberts 



The heavy line ^_^^^_ gives the average 



of these two. Before the sixth year the record 

 is from other sources. (Stephenson.) 



in the years between which it occurs, must always have 

 an undue extension over a curve of growth derived by 



