NO. 



EAR EXOSTOSES HRDLICKA 



21 



the same results as to the minor grades of the abnormaUties. Consid- 

 erable experience must be acquired by the student of these exostoses 

 before his records can have real value. 



The total new material and the gross results of the examination are 

 shown in the following table. 



Ear Exostoses in Different Racial Groups, New Observations 



Adults <• 

 (except as specified otherwise) 



Number 

 of skulls 

 examined 



Number 

 of skulls 

 with ear 

 exostoses 



Percent 

 of skulls 



with 

 exostoses 



Number 



of ears 



with 



exostoses 



Percent 



of ears 



with 



exostoses 



Egypt: 



XII D. Lisht 



XX D.— Ill Cont. Kharga. . . 



American: 



Eskimo 



Indian Children^ 



Old Pueblo 



North Dakota 



Florida 



California'^ 



NE. States (St. Lawrence 



River to Maryland) 



Peru 



Virginia 



Louisiana'' 



Arkansas'' 



S. Dakota (All, Mowbridge, 



Arikara, misc.) 



S. Dakota (Mowbridge alone) 

 Kentucky 



Polynesian: 



New Zealand 



Hawaii 



Asiatic: 



Chinese 



Malaysian: 



Pagi-Pagi 



Melanesian 



African : 



Negro (African and American) 



379 



75 



I ,ooo 



335 

 500 

 29 

 395 

 435 



112 



3,651 



65 



61 



173 



109 

 76 

 90 



19 



148 



77 



10 

 39 



2 



I 



12 



2 



35 

 46 



13 



522 



14 

 15 



47 



30 

 23 

 29 



4 

 39 



1.85 

 2.7 



0.2 



2.4 



6.9 



8.9 



10.6 



II. 6 

 14 -3 



21-5 



24.6 

 27 .2 



27-5 

 303 

 32.2 



21 . 1 

 26.4 



10 

 2 



4 

 I 



19 



2 



53 

 69 



19 



855 



25 



26 



75 



37 

 52 



7 

 60 



1-3 

 1-3 



18.4 

 20.3 



" Including a very small proportion of subadults. 



' From age when fully developed tympanic bone is in place to eruption of a permanent second 

 molar. A fair proportion of deformed, all three varieties of deformation. 

 ' Mainly of Channel Islands. 

 '' Mounds. 



Examination of our Egyptian material, all of which was collected 

 personally and is thoroughly identified, shows that although ear ex- 

 ostoses were rare, nevertheless they occured in the Egyptian.s — at root 

 a branch of the White stem- — as far back as 2000 B. C. 



