Xll PREFACE TO THE 



subject, which it must be allowed is one of 

 permanent interest, as well as of the attention 

 likely to be directed to it in future, I am bound 

 to correct those errors of my work, of which 

 subsequent experience and information may 

 have convinced me, and to make such addi- 

 tions and alterations as appear calculated to 

 improve it, and promote its utility. 



It would have been easy to have added 

 many further historical illustrations of the 

 first part of the subject ; but as I was unable 

 to supply the want I once alluded to, of ac- 

 counts of sufficient accuracy to ascertain what 

 part of the natural power of increase each 

 particular check destroys, it appeared to me 

 that the conclusion which I had before drawn 

 from very ample evidence of the only kind 

 that could be obtained, would hardly receive 

 much additional force by the accumulation 

 of more, precisely of the same description. 



In the two first books, therefore, the only 

 additions are a new chapter on France, and 

 one on England, chiefly in reference to facts 

 which have occurred since the publication of 

 the last edition. 



In the third book I have given an additional 



