They are regions of much labor and little leisure, of poverty to-day and anxiety for the morrow, of toil-cramped hands and toil-dulled brains.

In the fertile alluvial plains are wealth, leisure, contact with many minds, large urban centers where commodities and ideas are exchanged.

The two contrasted environments produce directly certain economic and social results, which, in turn, become the causes of secondary intellectual and artistic effects.

The low mountains of central Germany which von Treitschke cites as homes of poets and artists, owing to abundant and varied mineral wealth, are the seats of active industries and dense populations,[23] while their low reliefs present no serious obstacle to the numerous highways across them.

They, therefore, afford all conditions for culture.
[Sidenote: Indirect effects in differentiation of colonial peoples.] Let us take a different example.