MENTAL AND MORAL PHI LOS OP H Y, E TC 5 1 



and^ instructive. "It will be an assistance to genuine siudents qf 

 Aristotle^ Guardian. "// is indeed a work of gnat skill" 

 Saturday Review. 



Boole. AN INVESTIGATION OF THE L\\VS OF 

 THOUGHT, ON WHICH ARE FOUNDED THE 

 MATHEMATICAL THEORIES OF LOGIC AND PRO 

 BABILITIES. By GEORGL BOOLE, LLD. Professor of 

 Mathematics in the Queen's University, Ireland, &c. Svo. 14*. 



The design of this trcatis* is to investigate the fundamental laws of 

 those operations of the mind by which reasoning is performed ; to 

 give expression to them in the symbolical language of a Calculus, 

 and upon this foundation to establish the science of Logic and con 

 struct Us method: to make that method itself the basis of a general 

 method for the application of the mathematical doctrine of Proba 

 bilities ; and, fatally, to collect from the various elements of truth 

 brought to view in the course of these inquiries some probable inti 

 mations concerning the nature, and construction of the human 

 mind. The problem is one of the highest interest, and no one is 

 better able than Professor Boole to treat of this side of u at any ra'e. 



Butler (W. A.), Late Professor of Moral Philosophy in the 

 University of Dublin : 



LECTURES ON THE HISTORY OF ANCIENT PHILO 

 SOPHY. Edited from the Author's MSS., with Notes, by 

 WILLIAM HEPWORTH THOMPSON, M.A., Master of Trinity 

 College, and Regius Professor of Greek in the University of 

 Cambridge. Two Volumes. Svo. I/. $s. 



These Lectures consist of an Introductory Series on the Science of Mind 

 generally, and Jive other Series on Ancient Philosophy, the greater 



' part of which treat of Plato and the Platonists, the Fifth Series 

 'being an unfinished course on the Psychology of Aristotle, contain 

 ing an able Analvsis of the well known though by no means well 

 understood Treatise, irepl yvx-fjs. These Lectures are the result of 

 patient and conscientious examination of the original documents, 

 and may be considered as a perfectly independent contribution to our 

 knowledge of the great master of Grecian wisdom. The author a 

 intimate familiarity with the metaphysical writings of the last 

 century, and especially with the English and Scotch ^Jiool of 

 r> 2 



