6 STANLEY JEVON$ of which is of the first importance. There are units of three classes: (1)complete river-basins, (2) portions of river-basins, (3) plateaux, or portions of mountain masses. The larger tion, the greater the importance of its as nnits. For example, the Tapti River be treated as falling into three units--the and its two upper limbs; the Hahanadi the river basin under considera- sub-divisions basin might main valley into four units--the fan or cirque of the upper tributaries of each of the two important branches, the main valley, and the delta. In the Ganges valley quite a nnm- bet of units may be recognized: the monntains, foot hills, the sublnontane tract (terai), the Great Doab, Bundelkhand, Ganges-Sarda-Gogra Doab, Bihar High- lands, Central India Plateau, and so forth. Similarly we find well marked geo?'aphical nnits in other countries, e4/., in Great Britain where'we distinguish the Thames basin, the Weald of Kent, South Coast, Devon and Cornwall Peninsula, South Wales, Midlands, Lancashire-Cheshire plain, Ayrshire, Firths of Clyde and Forth, Fifeshire, etc. 8. Density of Population, Occ.pah?.s a..d Ra?ial Characters.--I! the watersheds are in strong relief the population will be concentrated bottoms and lower slopes, these mainly in the valley providing the fertile lands and tl?e sites favourable to the growth of towns; and it must continne to be so concentrated, excepting only where mineral wealth is discovered and developed. The occupational distribution is The higher mountain and hardy tribes who broadly as follows. regions are inhabited by bold gain their living by hunting and pa. sturing sheep, goats, etc., and sometimes by marauding. On the upper slopes a rough cultivation provides a bare subsistence, and but little more, for a rough and hardy people, and others get their living from the {oresis. In the rolling cormtry usually
