Hrdlicka. 



47 



cular power in the hands and arms of the individual to his body- 

 weight has about doubled. 



With the colored individuals we observe the interesting fact that 

 at almost all ages there exists in these children a greater propor- 

 tionate strength to each pound of the body than is the case with the 

 white children. 



The relations of force to weight here exposed may give rise to 

 much speculation as to their real causes. 



Relations of Pressure and Traction Force, in Pounds, to Each Pound 

 of Weight, in Children of the Different Color and Sexes, and 

 According to Age. 



AGE. 



Pressure Force on 

 Right Hand, Relation 

 in Pounds to Each 

 Pound of Weight. 



SB 



0.23 

 0.35 

 0.29 

 0.36 

 0.35 

 0.40 



0-44 

 0.53 

 0.45 

 0.50 

 0.51 



0.40 | 0.50 



0.44 

 0.43 

 0.43 

 0-39 

 0.43 



6. 40 



0.63 

 0.52 

 0.57 

 0.61 

 0.56 





0.31 

 0.35 

 0.47 

 0.40 

 0.53 

 0.37 

 0.47 

 0.42 

 0.41 



Pressure Force on 

 Left Hand, Relation 

 in Pounds to Each 

 Pound of Weight. 



£ 5 



0.30 

 0.30 

 36 

 0.38 

 0.45 

 0.46 

 0.47 

 0.49 

 0.47 

 0.48 

 0.54 

 0.56 

 0.59 



s£ 



0.31 

 0.30 

 0.44 

 0.37 

 0.43 

 0.36 

 0.45 

 0.40 

 0.40 



Traction Force, Rela- 

 tion in Pounds to Each 

 Pound of Weight. 



2 



0.18 

 0.25 

 0.24 

 0.30 

 0.34 

 0.35 

 0.37 

 0.34 

 0.31 

 0.33 

 0.38 

 0.38 

 0.33 



5=H 



0.21 

 0.20 

 0.27 

 0.27 

 0.33 

 0.19 

 0.32 

 0.24 

 0.28 



Arm Expanse. 



The arm expanse was not found to differ to any great extent in 

 the white children according to their different nationalities; it offers 

 only individual variations. In the negroes the average arm expanse 

 is greater at all ages. 



In both the white and the negroes the arm expanse increases with 

 the age of the children. Up to 9 years of age in the white boys 

 and up to 1 1 years of age in the white girls the arm expanse is less 

 than the total body height. In the negro children this is the case up 

 to the seventh year of life. From 9 and 11 years on, in the white 



