MENTAL AND MORAL PHILQSOPH V, ETC 5 1 



and instrucHvs. ^' It will be an assistance to genuine students of 

 Aristotle." — Guardian. "It is indeed a work of gt^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 GEORGt Boole, LLD. Professor of 

 Mathematics in the Queen's University, Ireland, &c. 8vo. 14?. 



The design of this treatise 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 its method j to make that method itself the basis of a general 

 method for the application of the mathematical doctrine of Proba- 

 bilities ; and, finally, to collect from the various eletnents of truth 

 brought to view in the course of these inquiries some pi-obable inti- 

 mations concerning the natu7'e 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 ofii 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 Univerbity of 

 Cambridge. Two Volam'es. 8vo. \l. ^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 Series 

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

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

 understood Treatise, irepl yvxijs. These Lectures are the result op 

 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's 

 intimxite familiarity with the metaphysical writings of the last 

 centtiry, and especially with the English and Scotch School of 

 D 2 



