TRANSVERSE MEASUREMENTS. 



TRANSVERSE MEASUREMENTS. 



The following, Table XVII, gives the transverse measurements, the extremes of variation, 

 and the mean of each one. 



TABLE XVII. 

 Transverse Measurements. 



From these measurements. Table XVII, a number of indices may be computed in order 

 to show the relation of these breadths to each other. 



FRONTO-BIORBITAL INDEX. 



The fronto-biorbital index is the index obtained by using the inter-frontomalare temporal 

 breadth as a unit and expressing the value of the least frontal breadth in terms of this 

 unit. This index has a range from 80.53 to 96.84. 



TRANSVERSE FRONTAL fNDEX. 



The transverse frontal index is obtained by expressing the value of the least frontal 

 breadth in terms of the greatest frontal breadth, the intercoronal. This index varies, in 

 the male, from 73.17 to 89.91; in the female, from 76.0 to 87.88. It shows the degree 

 of lateral arching of the frontals, and would be caused by more or less development of the 

 frontal lobes of the brain. 



FRONTO-MALAR INDEX. 



The fronto-malar index expresses the relation of the least frontal breadth in terms of 



the bizygomatic breadth. The extremes of variation of this index are 64.49 ^^^ 76.23. 



•The curve in figure 15 is not very smooth but is sufficient to show that the mode would 



be at either 67 or 68 if a larger number of indices could have been plotted. The Kameruns 



having a much broader face, show, in the curve, figure 16, that the mode is at 75. 



