LOGIC 



All M is A. 

 But all M is B. 



Therefore some B is A. 



f 



FIG. 57. 



299 



Fourth Figure. Here the middle term is the predicate 

 of the major premiss, and the subject of the minor : 



All A is M. 

 But all M is B. 

 Therefore some B is A. 



FIG. 58. 



In the first figure the valid moods are : AAA, All, 

 EAE, EIO. AAI and EAO are also valid but super- 



