MEASUREMENTS OF CRANIAL FOSS.E—HRDLldKA. 201 



After individiuil comparison, in the liunum adult, it is found that the 

 relations of the combined fossal, and the ventral leng'th, are as follows: 

 Both measurements are alike on the two sides" in 14:. 7 per cent of 

 cases. Both measurements are longer on the same side in 62.7 per 

 cent of cases. One of the measurements is equal on the two sides, 

 the other unequal, in 23.7 per cent of cases. 



The instances where the measurements agree, either in that each 

 is equal on the two sides of the skull, or in both being longer on the 

 same side of th3 skull, constitute nearly four-tifths of the cases, so 

 that agreement between the a-i-'))i-\-2^s length and the greatest ventral 

 length on each side may be said to be almost general. Of the excep- 

 tions only a few are marked. The highest discrepancy was a 7 mm. 

 diflerence in favor of the right combined fossal length in a case where 

 the ventral lengths were equal. 



The biterrelathm of the three cerebral cavities, shown hitherto only 



indirectly and incompletely, can be further brought out by comparing 



the lengths of the individual cavities with the sum of the lengths of 



.1 -1 .1 length of « fossa X 100 rc^^ ,; i • ■ 



the three, thus: , f — ^ ; ; jr^ . ihe results, which can 



length or a+v/i+^i^rossge 



be termed indexes, and are convenient for collation, are given, with 



three columns of supplemental comparisons, in the table below. 



« Differences up to one millimeter between the whole right and left side being 

 disregarded, as a possible error can not in such cases be excluded. 

 ^ That is, of anterior and middle and postero-superior fosste. 



