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INFLUENCES OF A MOUNTAIN ENVIRONMENT.
Zones of altitude--Politico-economic value of a varied relief--Belief and climate--Altitude zones of economic and cultural development--Altitude and density belts in tropical highlands--Increasing density where altitude confers safety--Geographic conditions affecting density of mountain population--Terrace agriculture--Its geographical distribution--Terrace agriculture in mountainous islands--Among savage peoples--Fertilizing terrace lands--Economy of level land--Mountain pastures and stock-raising--Life and industry of the summer herdsmen--Communal ownership of mountain pastures--Hay making in high mountains--Winter industries of mountain peoples--Overpopulation and emigration--Preventive checks to increase of population--Religious celibacy--Polyandry--Marauding tendencies in mountaineers--Historical consequences of mountain raiding--Conquest of mountain regions--Political dismemberment of mountain peoples--Types of mountain states--Significance of their small size--Mountain isolation and differentiation--Survival of primitive races in mountains--Diversity of peoples and dialects--Constriction of mountain areas of ethnic survival--Isolation and retardation of mountain regions--Mental and moral qualities of mountain people..