PREFACE TO THE SECOND EDITION. v 



consider defects in the doctrines of this book, especially in 

 the first part, which treats of deduction. Some of the 

 notices of the work were indeed rather statements of its 

 contents than critiques. Thus, I am much indebted to 

 M. Louis Liard, Professor of Philosophy at Bordeaux, for 

 the very careful exposition l of the substitutional view of 

 logic which he gave in the excellent Revue Pkilosophique, 

 edited by M. Kibot. (Mars, 1877, torn. iii. p. 277.) An 

 equally careful account of the system was given by 

 M. Kiehl, Professor of Philosophy at Graz, in his article on 

 " Die Eiiglische Logik der Gegenvvart," published in the 

 Vierteljahrsschrift fur wissenschaftliche Philosophic. ( I Heft, 

 Leipzig, 1876.) I should like to acknowledge also the 

 careful and able manner in which my book was reviewed 

 by the New York Daily Tribune and the New York Times. 

 The most serious objections which have been brought 

 against my treatment of logic have regard to my failure 

 to enter into an analysis of the ultimate nature and origin 

 of the Laws of Thought. The Spectator? for instance, in 

 the course of a careful review, says of the principle of 

 substitution, " Surely it is a great omission not to discuss 

 whence we get this great principle itself; whether it is a 

 pure law of the mind, or only an approximate lesson of 

 experience ; and if a pure product of the mind, whether 

 there are any other products of the same kind, furnished 

 by our knowing faculty itself." Professor Robertson, in 

 his very acute review, 3 likewise objects to the want of 



1 Since the above was written II. Liard has republished this exposition 

 as one chapter of an interesting and admirably lucid account of the 

 progress of logical soience in England. After a brief but clear introduc- 

 tion, treating of the views of llerschel, Mill, and others concerning 

 Inductive Logic, M. Liard describes in succession the logical systems of 

 George Beutham, Hamilton, Do Morgan, Boole, and that contained in 

 the present work. The title of the book is as follows : Les Logideiis 

 Anglais Contemporains. Par Louis Liard, Professeur de Philosophic & 

 la Faculle" des Lettres de Bordeaux. Paris : Librairie Germer Bailliere. 

 1878. (Note added November, 1878.) 



* Spectator, September 19, 1874, p. 1178. A second portion of the 

 review appeared in the same journal for September 26, 1874, p. 1204. 



3 Mind : a Quarterly Review of Psychology and Philosophy. No. II. 

 April 1876. VoL I. p. 206. 



