'<28 0//ZvGLANDERS. 



- "With a view of the bottom of the finUs^ 

 which terminates between the lines D 

 and E, where there appears a fubftance 

 in the form of a pear, which is the os 

 ethmoides, or fieve-hke bone ; through 

 which theolfa6lory nerves pafs, by which 

 the pituitary mem'brane receives its fen- 

 fibility, and the fenfe of fmelling is per* 

 formed. 



E, reprefents the beginning of the 

 maxillary finus, which terminates at 

 M. 



The (haded fpace which may be ob- 

 ferved between thefe two lines, rcpre- 

 lents the great cavities. 1 he oblique 

 ray marked F, is a bony partition, which 

 feparates this fmus into two parts, that 

 have no communication : and fometimes 

 it happens (though but rarely) that there 

 are two bony partitions •, and for this 

 reafon they are reprefented by the lines 

 marked F and G. It alfo fometimes 

 happens (but fliil more feldom) that there 

 are horfes, in whole heads we do not 

 find any of thefe bony partitions. 



N, points out the place of the cornets 

 orhofns. O, the redoubling. P, their 

 middle part. Q, the inferior part of 



them. 



