THE CUPOLA. 75 



across the whole forehead, and is called the os 

 frontis, or frontal bone. Another, across the 

 backside of the head, and shaped thus, A, is 

 the 05 occipitis. Its sharp top reaches to the 

 crown of the head. Another piece, shaped 

 a little like a clam shell, lies around each ear. 

 It is the 05 temporis. There are, of course, 

 two of these. On the top of the head, sur- 

 rounded by those already described, are the 

 two parietal bones. Surrounded by them all, 

 in the bottom of the skull, is a large bone, the 

 05 sphenoides, and a small one, the 05 ethmoi- 

 des. 



Now, as I shall hereafter show you more 

 fully, this whole space is filled up with brain. 

 In an adult, the brain weighs from two and a 

 half to three and a quarter pounds ; or it mea- 

 sures one quart or nearly. In a few instances, 

 it has been found somewhat larger. 



THE TEETH. Around one of the doors of 

 the cupola is a most remarkable arrangement, 

 which deserves a particular description. There 

 is a slight resemblance, here, to one Idnd of 

 wheels, with their component parts, or cogs. 



