INCREASE OF POPULATION. 191 



the time of building the great wall, China might have an 

 equally dense population. 



To proceed further, and to see when the amount of 

 700,000,000 of inhabitants is to be realized. Table 

 A will show the progressive increase of the people of the 

 United States, up to the year 2,000, or 150 years hence. 

 I have made the calculations at the rate of 35 per cent., 

 nearly what it has been from '40 to '50, for the next ten 

 years, to 1860 ; for the following ten, to 1870, at 30 per 

 cent. ; and from that period, at the rate of 25 per cent., 

 for whites. For slaves, at 23 per cent, only from 1850 ; 

 and for free colored at 15 per cent. These rates are 

 very moderate compared with past years. And it may 

 be supposed that 25 per cent, is not in keeping with the 

 past ratio of increase, but that increase cannot be main- 

 tained. The same amount of immigrants may flow into 

 America, but they cannot swell up the per centage to the 

 same degree upon a large population as they could on a 

 small one. For instance 500,000 on 10,000,000 would 

 be 5 per cent., on 30,000,000 it would be only 1 per 

 cent., and so on. 



To prove further that 25 per cent, is not much below 

 the future increase, after another 20 years, it is only 

 necessary to point out the following. The white popula- 

 tion in 1830 was only 10,526,246. From 1820 to '30, 

 the immigration was 140,000 ; and in 1840 the whites 

 were 14,189,108 ; the immigration that ten years was 

 601,000. Showing that, deducting immigration and 

 their increase, would leave the settled population's in- 

 crease to be 28* per cent., the increase of both to be 

 o4,"i, per cent, as per census. Therefore, considering 



