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ALES HRDLICKA 



to be the maximum breadth, and is moved in a zigzag way antero- 

 posteriorly, descending and again ascending by zigzags, until the 

 maximum breadth is found. The eyes watch only the scale. It is 

 necessary to repeat the movements in an ascending and possibly once 

 more in a descending direction, until the observer is positive that the 

 maximum breadth has been ascertained. 



Fig. 12. Method of holding iiistrument in measuring the breadth of head. 



Height.^ — The height from the middle of the line connecting the 

 floor of the auditory canals to bregma. 



Instrument: The spreading compass of HrdliSka (Fig. 10). 



Method: The instrument is held by the right hand just below the 

 joint. The head of the subject being steadied by the left hand, one 

 branch of the instrument is gently introduced into the left ear as far 

 as the guard permits, and the same is followed with the right ear. 



• The Monaco Agreement stipulates that the height of the head be taken from 

 "the superior border of the auditory opening" to the "vertex"; but no satisfactory 

 method for taking the measurement is offered or has ever been devised. The method 

 here described has been practiced by the author since 1898 and found effective. 



