viii PREFACE TO THE REVISED EDITION. 



since obtained a certain currency ; either in their original 

 forms or in modified forms. Misinterpretations are likely 

 to result. Readers who have met with them in other works 

 may, in the absence of warning, suppose, to my disadvan- 

 tage, that I have adopted them without acknowledgment. 

 Hence it must be understood that where no indication to 

 the contrary is given the substance is unchanged. Be- 

 yond the corrections which have been made in the original 

 text, there are, in some cases, additions to the evidence or 

 amplifications of the argument; but in all sections not 

 marked as new, the essential ideas set forth are the same as 

 they were in the original edition of 1864. 



BRIGHTON, 



August, 1898. 



