PECTORALIS MAJOR AND DELTOID INSERTION 



159 



The greater these indices of position, the more distal, the 

 smaller, the more proximal is the insertion of the muscle. Fol- 

 lowing is a short description of the mathematical treatment of 

 the length of the humerus and the indices which have been used 

 in this paper. A more detailed explanation of these methods, 

 which are absolutely necessary for an understanding of the 



Fig. 2 Small anthropometer with three parallel movable arms. 



measurements on a large number of individuals, is to be found 

 in the Textbook of Anthropology by R. Martin, Jena, 1914, p]). 

 63-103. 



The average (M) is the arithmetical mean of the individual 



values (F) of a group (/?. = number of individuals): M = -i;F. 



The standard deviation (a) is the square root of the average of 



