DESIGN OF THE HEAD. 



215 



examination and section of the bone at this part 

 shows how nature has strengthened it, by giving 

 it greater thickness and prominence, and by groin- 

 ing it within. We say groining it : for there is noth- 

 ing more resembhng the strong groinings or arches 

 of the ground-story of a great building, than the 

 ridges of the skull at this part of its base, which 

 cross at a centre corresponding with the promi- 

 nence of the occiput. 



In front, the form of the skull exhibits a provi- 

 sion not less distinct in its object. The parts of 

 the forehead which are most prominent and ex- 

 posed, {eminent icB frontales^ exhibit, on their sec- 

 tion, a thicker and denser bone ; whilst the lower 

 part of the forehead is formed of cells or sinuses, 

 which, throwing off the outer wall of the skull 



A. The parietal hox\e. 



B. The frontal bone. 



C. The occipitA bone. 



D. The tempered bone. 



E. The sphenoid bone. 



