346 



THE GROWTH OF THE BRAIN. 



the central cells find an equivalent modification in the 

 motor elements. Grigoresce J examined a series of 

 children of the ages below given, to determine the 

 strength of their grip as shown by the dynamometer. 

 The figures expressing the power of the grip for each 

 year are in every case averages of a hundred observa- 

 tions. 



TABLE 63. SHOWING THE INCREASE IN THE STRENGTH OF 

 THE/ GRIP WITH AGE; MEASUREMENTS WITH DYNAMO- 

 METER. (Grigoresce.} 



To be noted in this table is the remarkable increase 

 during the fourteenth and fifteenth years, equal in 

 amount to that occurring during the previous seven. 

 "The Autobiography of a Strength Seeker" 2 contains a 

 record of most remarkable gains in strength later in 

 life. The case of Windship is certainly exceptional, but 

 is here of interest by reason of the fact that, though 

 these gains are usually a mixed result of changes in the 

 muscle as well as the central nervous system, yet the 

 later in life they occur the more the central system must 

 be held responsible for them, since the muscles soon 

 reach a limit of growth. The capabilities of the nerve 



1 Grigoresce, Compt. Rend, de la Soc. de Biol., Paris, 1891. 



2 Windship, Atlantic Monthly, Boston, 1862. 



