lo6 Form cf the Cramu.m. [Book IX. 



os occipitis to the greater. When feen in any other 

 point of view, however, this refemblance is not per- 

 ceptible. The fides of the head are flat, and the lower 

 part is flat and irregular. The bones of the face con - 

 ftitute an imperfect triangle. The fize of the head, 

 in a well-formed pcrfon, is to the reft of the boijy as 

 one to nine. 



The. fubftance of the bones of the cranium is in 

 general made up of two tables or plates, with the in- 

 terpofition of a fpongy cavity. The external table is 

 thicker, fmoother, and covered with the ptrriofleum > 

 the internal is thinner, more uneven, more brittle, and 

 is lined with a thick vafcuhr membrane, called the 

 dura mater. 



The bones of the head are united to each other by 

 a number of tooth-like procefTes ; and thefe joinings 

 are called futures. The coronal future runs acrofs the 

 head, and connects the frontal bone to the parietal 

 bones. The fagittal future divides the upper part of 

 the head into two equal parts. It connects the two 

 parietal bones to each other, and pafles from the mid- 

 dle of the frontal to the middle of the occipital bone. 



The lambdoid future is interpofed between the back 

 and fore parts of the cranium, or between the occi- 

 pital and two parietal bones. The two fquamofe 

 futures connect the temporal bones to the parietal. 

 There are alib many lefs remarkable futures, which 

 join the bones of the face to thofc of the cranium. 



