HKIil.U K.V 



PJlVSTOLOdTCAL AND MEDICAL OBSEHV.VTIONS 



151 



ber of the groups the feinalo stren<2;th shows to better advantage, 

 but in general the results are related." With observations on a 

 much larger series of individuals the irregularities throughout would 

 undoubtedly diminish somewhat. 



Muscular force also varies very noticeably with age, declining in 

 general after 40, and occasionally even before that ]:)erio(l (see table, 

 pp. 144-14S). 



The relation of the force in the left to that in the right hand should 

 present in most of the Indian tribes examined and particularly in the 

 men, who do little manual labor of any kind except some farming, 

 more natural conditions than in the whites, where tlie hands are sul)- 

 jected to many widely varying forms of exercise. The actual coikU- 

 tions in the Indian children and adults are as follows: 



Pressure in left hand roiiijtarnl ii ith tJiat in right hand iriijht-liand pressure =1()()) in 



children 



Pressure in left liand compared icith that in right hand (right-hand pressure = 10()) in 



adults {all ages combined) 



The figures indicate that differences in this respect between chil- 

 dren and adults, and between tribe and tribe, are not great (within 



a See also detail cases in the Appendix. 



6 Differences in the percentage of the left-hand force compared with that in the right hand, in the 

 two sexes. The males show in most groups a larger percentage, or less difference, in the power in 

 the two hands than the female-s. the left hand in the male being in such instances stronger than 

 in the female, both absolutely and In comparison with the right hand. 



