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astoral nomads--Seasonal migrations--Marauding expeditions--Forms of defense against nomad depredations--Pastoral life as a training for soldiers--Capacity for political organization and consolidation--Centralization versus decentralization in nomadism--Spirit of independence among nomads--Resistance to conquest--Curtailment of nomadism--Supplementary agriculture of pastoral nomadism--Irrigation and horticulture--Scant diet of nomads--Effects of a diminishing water supply--Checks to population--Trade of nomads--Pastoral nomads as middlemen--Desert markets--Nomad industries--Arid lands as areas of arrested development--Mental and moral qualities of nomads--Religion of pastoral nomads. CHAPTER XV. MOUNTAIN BARRIERS AND THEIR PASSES Man as part of the mobile envelope of the earth--Inaccessibility of mountains--Mountains as transit regions--Transition forms of relief between highlands and lowlands--Piedmont belts as boundary zones--Density of population in piedmont belts--Piedmont towns and cities--Piedmonts as colonial or backwoods frontiers--Mountain carriers--Power of mountain barriers to block or deflect historical movement--Significance of mountain valleys--Longitudinal valleys--Passes in mountain barriers--Breadth of mountain barriers--Dominant transmontane routes--Height and form of mountain barriers--Contrasted accessibility of opposite slopes--Political and ethnic effects--Persistence of barrier nature--Importance of mountain passes--Geographic conditions affecting the historical importance of passes--Passes determine the transmontane routes--Navigable river approaches to passes--Types of settlement in the valley approaches--Pass cities and their markets--Pass peoples--Their political importance. CHAPTER XVI. 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--Overpopulati
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