The Indians of Cuzco 39 



Head Measurements. 



The head measurements were made in 85 males and 68 females. 

 The length was measured from the glabella to the occipital point. 

 The breadth was the greatest diameter at right angles with the 

 length. The height was the distance from the binauricular line 

 on the floor of the external auditory canal to the bregma. The 

 head height was determined by Hrdlicka's method, with a spread- 

 ing and sliding compass, the ends of the spreading compass 

 being placed in the external auditory meati with the scale over 

 the bregma and a reading made. The distance from the scale 

 arm to the bregma is measured by the arm of the sliding compass 

 and subtracted from the vertical distance from the plane of the 

 lower edge of the compass points to the scale arm. This gives 

 the vertical distance from the plane of the meatal floor to the 

 bregma or the head height. There is some chance for error in 

 this measurement on account of the difficulty of locating the 

 bregma in the living. 



In the male the head length averages 190 millimeters, with a 

 maximvmi of 208 and a minimum of 177, and a variation range 

 of 31. In the female the average length is 180, the extremes 

 195 and 163, and the variation range 2)^. 



The head breadth in the male averages 150, the greatest is 159, 

 the least is 139, and the variation range is 20. In the female the 

 average breadth is 145, the greatest 154, the least 135, and the 

 variation range 19. The head height in the male averages 134, 

 the extremes are 147 and 121, with a variation range of 26. In 

 the female the average height is 130, the greatest 139, the least 

 124, and the variation range 15. 



All three of the head measurements in the female are less than 

 in the male but there is less difference in the height than in the 

 other dimensions. The range of variation is nearly the same in 

 both sexes in the length and breadth, but is distinctly less in the 

 female in the case of the height. 



Both the average head length and breadth in the male as 

 obtained by the Expedition of 191 5 are distinctly greater than 

 Chervin's results or those of the Expedition of 1912. The head 

 height as determined by the 191 5 Expedition agrees with 

 Chervin's results but is somewhat greater than that obtained by 

 the 1912 Expedition. 



