Heinrich von Treitschke, Politik, Vol. I, p. 218. Leipzig, 1897.
For full discussion, see H.R. Mill, International Geography, pp. 79-81. New York, 1902.
Chapter XVI—Influences Of A Mountain Environment
Zones of altitude.
There are zones of latitude and zones of altitude. To every mountain region both these pertain, resulting in a nice interplay of geographic factors. Every mountain slope from summit to piedmont is, from the anthropo-geographical standpoint, a complex phenomenon. When high enough, it may show a graded series of contrasted complementary locations, closely interdependent grouping of populations and employments, every degree of density from congestion to vacancy, every range of cultural development from industrialism to nomadism. The southern slope of the Monte Rosa Alps, from the glacier cap at 4500 meters to the banks of the Po River, yields within certain limits a zonal epitome of European life from Lapland to the Mediterranean. The long incline from the summit of Mount Everest (8840 meters) in the eastern Himalayas, through Darjeeling down to sea level at Calcutta, comprises in a few miles the climatic and cultural range of Asia from Arctic to Tropic.
Politico-economic value of varied relief.