150 



THE RATE OF GROWTH 



[CH. 



1800 1850 1900 1940 



Fig. 29. Decennial increments of the population of the United States. 

 * The Civil War. * * The "slump". 



1800 1850 1900 1950 2000 



Fig. 30. Conjectural population of the United States, 

 according to the Verhulst- Pearl Law. 



