PREFACE TO SECOND EDITION. 



THE principal reason for designating this volume a second 

 edition consists in the fact that the greater portion of what 

 may be termed the first edition is incorporated into it. Be 

 sides various omissions (principally where the former treat 

 ment has since seemed to me needlessly prolix), I have added 

 new matter, not much inferior in amount to the whole of 

 the original work. In addition, moreover, to these altera 

 tions in the matter, the general arrangement of the subject 

 as regards the successive chapters has been completely 

 changed; the former arrangement having been (as it now 

 seems to me) justly objected to as deficient and awkward in 

 method. 



After saying this, it ought to be explained whether any 

 change of general view or results will be found in the present 

 treatment. 



The general view of Probability adopted is quite un 

 changed, further reading and reflection having only confirmed 

 me in the conviction that this is the soundest and most 

 fruitful way of regarding the subject. It is the more ne 

 cessary to say this, as to a cursory reader it might seem 



