Vlii ADVERTISEMENT TO THE SIXTH EDITION. 



It is in compliance with this suggestion that these volumes 

 now appear as a distinct work, and (though greatly enlarged by 

 new matter) at a considerable reduction of price ; but at the same 

 time it is hoped that a new edition of the two remaining volumes 

 will follow at a future period, when they will be also given as a 

 distinct work, comprising the anatomy, physiology, orismology, 

 &c. of the science. 



