DIFFERENCE IN COLOURS 255 



unlike any of its originals ; that the difference in colour 

 is due to the fact that blue and black in the iris and 

 black and brown in the hair very seldom mix, these 

 colours being, as has been said, " mutually exclusive." 

 They persist when everything else, down to the bony 

 framework, has been modified and the original racial 

 characters obliterated. Nevertheless, we see that these 

 mutually exclusive colours do mix in some individuals 

 both in the eyes and hair. In the grey-blue iris it 

 appears as a very slight pigmentation, in most cases 

 round the pupil, but in the hair it is more marked. 

 Many, perhaps a majority, of the dark-eyed people we 

 are now considering have some warm brown colour in 

 their black hair ; in members of the same family you 

 will often find raven-black hair and brownish-black 

 hair; and sometimes in three brothers or sisters you 

 will find the two original colours, black and brown, 

 and the intermediate very dark or brownish - black 

 hair. 



The brunette of this oval-faced type is also, as we 

 have seen, deficient in colour, but, as a rule, she is more 

 attractive than her light-eyed sister. This may be due 

 to the appearance of a greater intensity of life in the 

 dark eye ; but it is also probable that there is almost 

 always some difference in disposition, that black or dark 

 pigment is correlated with a warmer, quicker, more 

 sympathetic nature. The anthropologists tell us that 

 very slight differences in intensity of pigmentation may 

 correspond to relatively very great constitutional differ- 



