ANTHROPOMETRY 



75 



dilated; a more or less unconscious dilatation will take place in some 

 subjects when the measurement is to be taken. 



Mouth. — Breadth: The distance between the angles of the mouth 

 at points where the mucous membrane joins the skin, with mouth 

 naturally closed, without tension. 



Instrument: Sliding compass. 



Method: Apply forefinger of left hand to the chin and the medius 

 below the chin. Place fixed branch of instrument on forefinger, 



• )^, 



'■■ ^. 



•, 1^ 



Fia. 14. Length and breadth of ear. 



apply to right corner of the mouth, bring point of sliding branch to 

 left corner (without exactly touching either), remove instrument and 

 read measurement. 

 Left Ear. — The left ear for a right handed observer is much easier 



