ADVERTISEMENT 



TO THE SIXTH EDITION. 



Jan. 2d, 1826. 



The additions to the present edition chiefly 

 consist of some further documents and infe- 

 rences relating to the state of the population 

 in those countries, in which fresh enumera- 

 tions, and registers of births, deaths and mar- 

 riages, have appeared since the publication of 

 my last edition in 1817. They refer princi- 

 pally to England, France, Sweden, Russia, 

 Prussia, and America, and will be found in the 

 chapters which treat of the population of 

 these countries. In the chapter on the Fruit- 

 fulness of Marriages an additional table has 

 been given, (vol. i. p. 498.) which, from the 

 per centage increase of population in the in- 

 terval between those decennial enumerations 

 which are now taking place in some countries, 

 shews the period of their doubling, or the rate 

 at which they are increasing. At the end of 



