298 ELEMENTS OF SCIENCE 



First Figure. Here the middle term is the subject 

 of the major premiss and the predicate of the minor : 



All M is A. 

 But all B is M. 

 Therefore all B is A. 



FIG. 55. 



Second Figure. Here the middle term is the predicate 

 of both premisses : 



All A is M. 

 But no B is M. 

 Therefore no B is A. 



FIG. 56. 



Third Figure. Here the middle term is the subject of 

 both premisses ; 



