HE PRINCIPLES OF SCIENCE 



LOGIC 



BY 



W. STANLEY JEVONS, M.A., F.R.S., 



FELLOW OF UNIVERSITY COLLEGE, LONDON ; 

 PEOFESSOK OF LOGIC AND POLITICAL ECONOMY IN THE OWE>'S COLLEGE, MANCHESTER. 



VOL. II. 



f onto on 



MACMILLAN AND CO. 



1874 



[ The Right of Translation and Reproduction it reserved.^ 



