184 



DEVELOPMENT OF EXTERNAL NOSE IN WHITES AND NEGROES. 



the sixteenth week, 110.0 in the eighteenth week, and 120.0 in the twentieth week. 

 All of these figures are above the averages in whites of corresponding ages. 



Of the monkey fetuses previously used for comparison, the younger macacus 

 had a nasal index of 75.0, the older one 72.7; the younger gorilla 93.7, and the 

 older one 95.0. These values are lower than those of corresponding stages in man, 

 which is la^ ^ly a consequence of the greater facial and nasal height in apes. 



INTEROCULAR BREADTH. 



Table 1 1 is a compilation of the averages and ranges of variation of the absolute 

 and relative interocular breadth and of the relation between nasal breadth and inter- 

 ocular breadth. The relative ranges of variation of the interocular breadth of 



TABLE 11. 



TABLE 12. Relative 

 ranges of variation. 



whites are as shown in table 12. With an average relative range of variation of 32.6 

 the interocular breadth seems to be somewhat less variable than the nasal breadth 

 and height. During fetal life the averages of the interocular breadth are smaller 

 in negroes than in whites, with the exception of the twentieth 

 week and the ninth and tenth months. These differences are 

 for the most part, however, so insignificant that no great stress 

 can be placed upon them. The relative interocular breadth is 

 also rather variable, but does not equal the relative nasal 

 breadth in this respect, the latter having an average relative 

 range of variation for whites from the twelfth to the seven- 

 teenth week of 36.1, the corresponding figure for the former 

 being only 28.9. The interocular breadth shows, therefore, a 

 closer correlation to the interzygomatic breadth than does the 

 nasal breadth. In both races the relative interocular breadth drops rapidly until 

 the end of the fourth month; thereafter the decrease is only small, especially in 



