marked off from each other, it is easy to pass from one class of occupations, and consequently from one social grade, to another. Finally, under the same circumstances education, skill, and superior training have but inferior value compared with what they have in densely populated countries. The advantages lie, in an under-populated country, with the coarser, unskilled, manual occupations, and not with the highest devdopments of science, literature, and art.
If now we turn for comparison to cases of over-population we see that the struggle for existence and the competition of life are intense where the pressure of population is great. This competition draws out the highest achievements. It makes the advantages of capital, education, talent, skill, and training tell to the utmost. It draws out the social scale upwards and downwards to great extremes and produces aristocratic social organizations in spite of all dogmas of equality. Landlords, tenants (i.e., capitalist employers), and laborers are the three primary divisions of any aristocratic order, and they are sure to be developed whenever land bears rent and whenever tillage requires the application of large capital. At the same time liberty has to undergo curtailment. A man who has a square mile to himself can easily do as he likes, but a man who walks Broadway at noon or lives in a tenement-house finds his power to do as he likes limited by scores of considerations for the rights and feelings of his fellowmen. Furthermore, organization with subordination and discipline is essential in order that the society as a whole may win a support from the land. In an over-populated country the extremes of wealth and luxury are presented side by side with the extremes of poverty and distress. They are equally the products of an intense social pressure. The achieve-
