BRACHIAL PLEXUS OF NERVES IN MAN 295 



among the white males and 15 per cent among the white females 

 occurring in group 2, a difference of 12.69 per cent in favor of the 

 white males. 



The 31 plexuses of group 2 from colored subjects are 17 from 

 males and 14 from female^. Compared with the total number of 

 plexuses from male and female colored subjects, namely 49 and 

 41, we have 34.69 per cent of group 2 among the colored males 

 and 34.14 per cent among the colored females, a nearly equal 

 distribution between the two sexes among the colored. 



From the above, it will be seen that while group 2 occurs 

 among colored males and females about equally often, that it is 

 found very much more often among the white males than among 

 white females. 



Group three 



Table 4 shows that of the 13 plexuses in this group 9 are from 

 male subjects or 69.23 per cent and that 4 are from females, 30.76 

 per cent, that is, that more than twice as many are from males 

 as from females. Comparing the number of male and female 

 plexuses in this group with the total number of records from each 

 sex, tables 5 and 6, we find that among the 114 plexuses from 

 males, 9 are in group 3 or 7.89 per cent, and among the 61 plexuses 

 from females, 4 are in group 3 or 6.55 per cent. This shows a 

 variation of but slightly over 1 per cent. 



It will be seen from table 4 that 3 of the plexuses, 23.07 per 

 cent, of group 3 are from colored males and 6, 46.14 per cent, are 

 from white males, or exactly 1 to 2. Six of the 65 plexuses from 

 white males or 9.23 per cent are in group 3, and 13 of the 49 plex- 

 uses from colored males or 6.12 per cent are in this group, a 

 difference in favor of the white males of only 3.11 per cent. 



There are twice as many plexuses in this group from males on 

 the left as on the right side, that is, 6 to 3. Six of the 58 plexuses 

 from the left side of male subjects or 10.34 per cent and only 3 

 of the 56 from the right side or 5.35 per cent are in group 3, a 

 difference of 4.99 per cent. 



In group 3 the plexuses are distributed equally between colored 

 and white females, 2 of each, as the total number of plexuses from 



