ALEXANDER (1818-1903).-Philosopher, _b._ at Aberdeen, and graduated at Marischal Coll. there, became in 1860 Professor of Logic in his university, and wrote a number of works on philosophy and psychology, including _The Senses and the Intellect_ (1855), _The Emotions and the Will_, _Mental and Moral Science_ (1868), _Logic_ (1870), and _Educat