SOCIETY OF THE UNIVERSITY Otf ABERDEEN. 237 



to 55 per cent., while in only two groups (at Elmshorn and Scotland 

 Yard) does the proportion of the chimpanzee type exceed 10 per 

 cent. In nineteen of the male groups the proportion of the orang 

 type varies from 15 to 30 per cent., the chimpanzee type occurring in 

 a nearly equal proportion. 



There is also a correlationship between the colour of hair and the 

 ratio in which these types of ear occur. In every one of the groups 

 examined the fair-haired individuals showed a distinctly greater 

 percentage of the orang type than the black-haired ; while the chim- 

 panzee type occurred in a larger proportion of black-haired than of 

 fair-haired. 



From an examination of the data given in Table IV. it will be 

 found that there is no correlationship between the ratio in which 

 these two types of ear occur and the bias to insanity. The insane 

 men in Aberdeen and Cork asylums show the orang type less fre- 

 quently than the sane ; in Dublin the case is the reverse ; so, too, as 

 regards the occurrence of the orang type in women of these asylums. 

 Nor is there any constant difference in the ratio in which the chim- 

 panzee type is found in the sane and insane. 



The types of ear described by Continental writers as Wilder- 

 muth and Morellische, and regarded by them as occurring with undue 

 frequency amongst the insane forms are marked examples of what is 

 here regarded as the orang type. 



In the criminal population of Scotland Yard there is a distinct 

 departure from the usual ratio in which the orang and chimpanzee 

 types occur. In the males the orang type occurs more frequently 

 than in any other group of men examined, whilst amongst the women 

 criminals exactly the opposite obtains the orang type occurs less 

 frequently than in any other group of women. There is here a sexual 

 inversion. The chimpanzee type occurs among male criminals with a 

 normal frequency, but amongst the women this type is abnormally 

 frequent. 



When, however, we wish to put the d of a to the main purpose for 

 which this investigation was undertaken, namely, to discover the 



