MENTAL AND MORAL PHI LOS OP H V, E TC 5 \ 



and instructive. "It will be an assistance to genuine students of 

 Aristotle."— Guardian. "It is indeed a work of gt c at skill." — 

 Saturday Review. 



Boole. — AN INVESTIGATION OF THE LAWS OF 

 THOUGHT, ON WHICH ARE FOUNDED THE 

 MATHEMATICAL THEORIES OF LOGIC AND PRO- 

 BABILITIES. By George Boole, LLD. Professor of 

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



The design oj this treatiu is to investigate the fundamental laws oj 

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

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

 a;td upon this foundation to establish the science of logic and con - 

 struct its method ; to make that method itself the basis of a general 

 method Jor the application of the mathematical doctrine of Proba • 

 bilities ; and, finally, 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 oj ii at any rate. 



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. 1/. $s. 



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

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

 part of which treat of Plato and the Platonists, the Fifth Serifs 

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

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

 understood Treatise, irepl yuxrjs. 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 

 knmvledge of the great master of Grecian wisdom. The author s 

 intimate familiarity with the metaphysical writings of the last 

 century, and especially with the English and Scotch School of 

 p 2 



