SOCIETY OF THE UNIVERSITY OF ABERDEEN. 



129 



The percentages for each of the different grades of vision are 

 seen to be very close for all colours of iris, so that the acuteness of 

 vision (without correction) seems to depend little, if any, on the colour 

 of the iris. 



In the following table is shown the relation of the colour of the 

 iris and the colour of the hair. The three groups of the colours of 

 the iris are each subdivided into five, according to the colour of the 

 hair black, dark, brown, fair, red. 



In the red-haired group the medium irides are in greater pro- 

 portion than in the other groups of colour of hair. 



The following table shows the relation between the colour of the 

 iris and the colour of the skin. The three groups of colour of iris are 

 each divided into three, according to the colour of the skin dark, 

 ruddy, pale. 



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