148 



HARRIS HAWTHORNE WILDER. 



margin, sufficient to indicate the position of the line approxi- 

 mately, and the case is assisted by the presence of a "lower" 

 or proximal triradius, one radient of which practically coincides 

 with the supposititious C line. Thus between the two a boundary 

 is fixed between the areas of the fourth and the third interdigital 

 patterns, while the second, and the boundary between it and the 

 third are definitely indicated by means of the main triradii. 



FIG. 7. Print of a right sole, showing the method of dividing the "ball" into 

 its four interdigital areas, each of which may be separately described by formula. 

 This method is fundamentally different from that used for the palm, as shown in 

 Figs, i and 2. Formula: W-L-CI-0-H-H2. 



Now in all cases, whether the limits are precise, as in Fig. 7, 

 or approximate, as in Fig. 8, the "ball" of the foot is easily 

 divided up into areas corresponding to the four interdigital 

 patterns. Of these the first, beneath the great toe, or rather 



