168 



ADOLF H. SCHULTZ 



of position, which has just been discussed and which uses 

 the mesLU value depending on the two terminal points of 

 the insertion, from the great variability of the upper point it 

 was found necessary to calculate a second position index for the 

 deltoid, employing only the most distal point of insertion. This 

 new index gives information as to how far down the deltoid ex- 

 tends upon the humerus. The formula for this index, using the 

 measurements of figure 1, reads as follows: 



measurement 5 

 measurement 1 



X 100 



The averages and conditions of variability of the index of the 

 relative position of the most distal point of attachment of the 

 deltoid are given in table 7. The entire variation reaching from 

 44.8 to 57.5 comprises 25 per cent of the mean obtained fromthe 

 end values just cited; it is therefore relatively much smaller 

 than the variation of the preceding index, which employed the 

 middle point of insertion. The variation coefficients in table 7 

 lie in all the groups below those in table 6 and should be consid- 

 ered as relatively small. The position of the most distal point 



TABLE 



Averages, standard deviations, variation-coefficients, their probable errors and 

 ranges of variation for the position index of the most distal point of insertion of 

 the deltoid muscle 



