180 



DEVELOPMENT OF EXTERNAL NOSE IN WHITES AND NEGROES. 



TABLE 5. 



unquestionably a chance occurrence and due to the small number of specimens 

 composing this group. Using the same method employed in connection with the 

 study of the nasal height, the relative increases in size of the nasal breadth were 

 found to be as shown in table 7. 



The relative increase in size of the nasal breadth seems to be but little corre- 

 lated to the growth of the body (represented by the sitting height) or to the increase 

 in the nasal height. The relative increase in the sitting height considerably exceeds 

 that of the nasal breadth. The height of the nose also shows more rapid growth 

 than the breadth. The latter relation becomes still more marked TABLE 6. Relative 

 during postnatal growth. As a consequence, the nasal index 

 decreases from early uterine to adult life. The relative increase 

 in size of both height and breadth of the nose seems to be espe- 

 cially small in the fifth and seventh month of pregnancy, while the 

 most active growth occurs prior to the fifth month. These condi- 

 tions indicate a certain rhythm of growth, which may be similar to 

 the one established for the body-height after birth. During the 



ranges of variation. 



entire development the averages of the nasal breadth of negroes are, without 

 exception, greater than in whites. The ranges of variation of this measurement 

 in the two races, however, overlap. 



A constant and well-marked racial difference is also found in the relative 

 nasal breadth. As early as the eleventh week fetuses show this difference, which 

 becomes quite marked after the fourth month. The averages in negroes are always 

 greater than the corresponding ones in whites. In both races the averages of this 

 index fall rapidly from the tenth to the fifteenth week as a matter of fact, almost 

 one-third of the average which it has reached at the end of this period. During the 

 fifth month this relative measurement drops still lower in whites and increases 

 slightly in negroes. Thereafter it increases irregularly, to reach a second maximum 



