AN INVESTIGATION 



OF 



THE LAWS OF THOUGHT, 



ON WHICH ARE FOUNDED 



THE MATHEMATICAL THEORIES OF LOGIC 

 AND PROBABILITIES. 



BY 



GEORGE BOOLE, LL.D. 



it 



PROFESSOR OF MATHEMATICS IN QUEEN'S COLLEGE, CORK. 



LONDON: 

 WALTON AND MABERLY, 



UPPER GOWER-STREET, AND IVY-LANE, PATERNOSTER-ROW, 



CAMBRIDGE: MACMILLAN AND CO. 



1854, 



