NO. I 



THE HYPOTROCH'ANTERIC FOSSA IIRDLICKA 



31 



Hypotrochanteric Fossa in the Young 

 Younger Children (about term to 6 years) 



Older Children (approximately 7 to 13 years) 



Old Egyptians (45) 

 N. A. Indians (64) 

 Eskimo (55) 



Adolescents (approximately 14 to 21 years) 



U. S. Whites (26) 



U. S. Negroes (100) 



Old Egyptians (35) 



Old Peruvians (79) 



N. A. Indians (279) 



Eskimo (99) 



The main facts brought out by the above figures are obvious. 



There are marked racial differences from early childhood onward. 



The Whites and the Negroes among the adolescents, and the 

 Eskimos during childhood, show the least incidence and development 

 of the fossa, the Old Egyptians from later childhood on and the 

 North American Indians throughout, the most. 



In adolescents, outside of those of the U. S. Whites and Negroes, 

 conditions show remarkable similarity. The fossa is very common, 

 and in from 30 to 40 percent of the femora it is at this stage a very 

 marked feature of the proximal third of the shaft of the femur. 

 This showing, it will be seen later, is of exceptional interest in the 

 generic history of the fossa. 

 3 



