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Show i9oo] PHYSIOGRAPHY 9 GeorgiaX The Appalachians are not a continuous range and exhibit many breaks and groups, but may nevertheless be regarded as a single system. Their highest points are found in the White Mountains of New Hampshire and the Black Mountains of North Carolina, which reach altitudes of over six thousand feet; the central part of the system is seldom over three thousand feet in height, and usually less. \ Tracing this system from the north, the most striking gap in its continuity is made by the Hudson River, with its extension up the valley of the Mohawk to the Great Lakes and down the valley of Lake Champlain to the St. Lawrence. This leaves the Adirondack Mountains of northern" New York as an isolated group, and quite cuts off the Appalachians of New England and eastern Canada from the ridges of the south. \ In New England there are two well- marked groups of elevation, separated by the Connecticut River- the Green and the White mountains, which reach their greatest heights in Vermont and New Hampshire; yet nowhere in New England is there a sufficient elevation to offer any very decided obstruction to migration and communication. West and south of the Hudson Valley rises the central division of the Appalachians, presenting several detached groups of eminences, of which the Catskill Mountains, in southeastern New York, are the most conspicuous. In Pennsylvania, New |
