OUR FACE FROM FISH TO MAN 



sequently the mechanism of the development of 

 any given part may be threefold: that is, it may 

 involve first, its own inherent and probably heredi- 

 tary growth power; secondly, the quality or amount 

 of specific hormones produced by the endocrine 

 glands; thirdly, the degree of receptivity of each 

 part to the stimulation of the hormones. 



The common saying, *'As plain as the nose on 

 one's face" is an unscientific recognition of the 

 dominance of the nose in the human physiognomy. 

 The studies of Schultz on the development and 

 growth of the human nose, and of Stockard on the 

 principles and factors of development and growth 

 in general give us a slight hint of the complexity 

 of the factors that mould the individual nose. 

 Except in the case of identical twins no two 

 persons will carry the same hereditary factors 

 affecting nose form, while even in the case of 

 identical twins the nutritional factors can hardly 

 be exactly the same, especially after birth. The 

 resulting diversity in nose form is as bewildering 

 as the diversity in patterns of a kaleidoscope and, 

 at least to some extent, is conditioned by the same 

 law of chance associations of hereditary and 



environmental influences. 



172 



