POPULATION. 155 



primd facie evidence that the population of the United 

 States has for a considerable time been going on 

 doubling itself in 25 years. 



The emigration to the United States from Europe, 

 for the last 25 years, falls decidedly short of 10,000 

 persons per annum. 



Censuses. 



When a census is taken every ten years, all above 

 ten years, exclusive of emigrants, must have existed 

 in the census immediately preceding ; and conse- 

 quently, after having made a proper allowance for 

 the mortality during these ten years, the excess 

 above the remaining number must be attributed to 

 emigration. 



If we had the means of estimating with accuracy 

 the loss which would be sustained in America, by a 

 population not increased by additional births, this 

 mode of estimating the amount of emigration would 

 be unobjectionable, and often very useful ; but, un- 

 fortunately, the means are deficient, for even the an- 

 nual mortality in the United States is not known. 



On account of the number of males absent from 

 home, it has been proposed to estimate the increase 

 of population by the females only. 



Mortality. 



A mortality of about 1 in 20 would probably keep 

 the births on a level with the deaths, though all mar- 

 ried at twenty years of age. 



The annual mortality in England is about 1 in 58. 



The Cape of Good Hope. 



The total population of the Cape of Good Hope, 

 in 1821, was as follows : 



Males .... 24,977 

 Females . . . 23,001 



