In the United States to 1860 population has doubled itself about every twenty years, while in France there is practically no increase of population. It is stated that the white population of the United States between 1790 and 1840 increased 400.4 per cent, deducting immigration. The extraordinary advance of population with us, where subsistence is easily attainable, is to be seen in the chart on the next page (No. III), which shows the striking rapidity of increase in the United States when compared with the older countries of Europe. The steady demand for land can be seen by the gradual westward movement of the center of population, as seen in chart No. IV (p. 116), and by the rapid settlement of the distant parts of our country, as shown by the two charts (frontispieces), which represent to the eye by heavier colors the areas of the more densely settled districts in 1830 and in 1880. [Illustration.] Chart III: Population of European Countries, XIXth Century. § 3. By what Checks the Increase of Population is Practically Limited. The obstacle to a just understanding of the subject arises from too confused a notion of the causes which, at most times and places, keep the actual increase of mankind so far behind the capacity. The conduct of human creatures is more or less influenced by foresight of consequences, and by some impulses superior to mere animal instincts; and they do not, therefore, propagate like swine, but are capable, though in very unequal degrees, of being withheld by prudence, or by the social affections, from giving existence to beings born only to misery and premature death. Malthus found an explanation of the anomaly that in the Swiss villages, with the longest average duration of life, there were the fewest births, by noting that no one married until a cow-herd’s cottage became vacant, and precisely because the tenants lived so long were the new-comers long kept out of a place. In proportion as mankind rise above the condition of the beast, population is restrained by the fear of want, rather than by want itself. Even where there is no question of starvation, many are similarly acted upon by the apprehension of losing what have come to be regarded as the decencies of their situation in life. Among the middle classes, in many individual instances, there is an additional restraint exercised from the desire of doing more than maintaining their circumstances—of improving them; but such a desire is rarely found, or rarely has that effect, in the laboring-classes. If they can bring up a family as they were themselves brought up, even the prudent among them are usually satisfied. Too often they do not think even of that, but rely on fortune, or on the resources to be found in legal or voluntary charity. [Illustration.]