292 ABRAM T. KERR 



plexuses, table 5. We thus see that comparing each sex 

 separately there are over 4 per cent more plexuses from females 

 than from males belonging to group 1. 



There are 41 plexuses from white males among the 110 plexuses 

 in group 1 or 37.37 per cent of the group, and 29 plexuses from 

 colored males or 26.36 per cent of the group. There are in all 

 65 plexuses from white males, and 41 of these or 63.07 per cent 

 are in group 1. Of the 49 plexuses from colored males, 29 or 

 59.18 per cent are in group 1. It would appear then that among 

 males, the brachial plexus receives a branch from the fourth 

 cervical nerve 3.89 per cent more frequently among the white 

 than among the colored. 



Thirty-four of the 110 plexuses in group 1 are from the right 

 side of male subjects, or 30.90 per cent of the group, 36 or 32.72 

 per cent are from the left side of male subjects, a difference of 

 less than 2 per cent, table 2. Of the 56 right male plexuses studied, 

 34 or 60.71 per cent are in group 1 and of the 58 left male plexuses 

 studied, 36 or 62.06 per cent are in this group, a difference in 

 favor of the left of 1.35 per cent. 



Fifteen, or 13.63 per cent of the 110 plexuses in group 1 are 

 from white females, and 25 or 22.72 per cent of the group are 

 from colored females. There are in all 20 plexuses from white 

 females, and 15 of these, or 75 per cent are in group 1. Twenty- 

 five, or 60.97 per cent of the 41 plexuses from colored females 

 are in gi^oup 1. Group 1 plexuses would appear to occur over 

 14 per cent more often among white than among colored females. 



There are 20 right and 20 left plexuses from females that fall 

 in group 1, 18.18 p^r cent of the group in each case. Of the 

 31 female plexuses from the right side, 20 or 64.51 per cent are in 

 group 1, and of the 30 female plexuses from the left side, 20 or 

 66.66 per cent are in the group, a difference in favor of the left 

 of 2.15 per cent. 



As regards the two sides of the body, the plexuses in group 1 

 are distributed nearly equally, 54 on the right side and 56 on the 

 left side, table 2. The total number of plexuses considered is 

 distributed nearly equally between the two sides of the body, 87 

 on the right side and 88 on the left side. It will be seen then that 



