186 CHARLES R. STOCKARD AND A. L. JOHNSON 



The percentages of palatal length to total skull base clearly 

 show that in short skulls with short muzzles the proportional 

 percentage of palate to total skull base is very small, but 

 that this percentage increases in those skulls that are longer 

 and have longer muzzles. Thus we find that the percentage 

 of palatal length to total skull base is a very significant 

 relation, for when this proportion is known one may accurately 

 estimate the type of skull concerned. Comparing the curves 

 with the figures along the base line, one can be quite certain 

 that when the palate forms less than 53 per cent of the total 

 skull base, the skull as a whole is short and wide, and further, 

 that as the percentage of palate length to total skull base 

 increases beyond 53 and on to the maximum of 60 per cent, 

 the skulls are long and narrow. 



COMPARISON OF MEASUREMENTS FROM THE ORIFICE OF THE 

 AUDITORY MEATUS TO SEVERAL DEFINITE POINTS 



The measurements to be considered at this time were taken 

 by placing the ear rests of the head-spanner in the orifice 

 of the auditory meatus and the tip of the scale at a definite 

 selected point. The measurement was then read from the 

 scale. The distances thus represent the shortest lines between 

 the two points irrespective of the intervening angles and 

 curvatures of the skull. 



For this series of comparisons, the seventy skulls were 

 arranged in a sequence based on the distance from auditory 

 meatus to bregma (pi. 35, fig. 3, O-C). These measurements 

 (text-fig. 35) show a range of from 73 mm down to 41 mm, 

 the extremes being as 1.78 : 1. Between the two extremes the 

 lines representing the various skulls form a rather regular 

 and gradual slope. The differences among these measure- 

 ments are surprisingly small when one considers that the 

 series contains not only the normal and highly modified skulls, 

 but giant and midget skulls as well. 



Four other groups of measurements were made for com- 

 parison with the auditory meatus to bregma series, and were 

 plotted with the skulls in the same sequence. 



