Forest physiography; physiography of the United States and principles of soils in relation to forestry . ulations ofmaterial should produce islands of drier land. The whole region ap-pears to be very young; it is almost without soil or definite surfacedrainage. As a result of the slight relief there is no sharp dividing line 1 L. S. Griswold, Notes on the Geology of Southern Florida, Bull. Mus. Comp. Zobl.,vol. 28, 1896. 2 A. Agassiz, The Elevated Reefs of Florida, Bull. Mus. Comp. Zo61., vol. 28, 1896, p. 30. PENINSULA OF FLORIDA 549 between the Everglades and the surrounding country, and a d
Forest physiography; physiography of the United States and principles of soils in relation to forestry . ulations ofmaterial should produce islands of drier land. The whole region ap-pears to be very young; it is almost without soil or definite surfacedrainage. As a result of the slight relief there is no sharp dividing line 1 L. S. Griswold, Notes on the Geology of Southern Florida, Bull. Mus. Comp. Zobl.,vol. 28, 1896. 2 A. Agassiz, The Elevated Reefs of Florida, Bull. Mus. Comp. Zo61., vol. 28, 1896, p. 30. PENINSULA OF FLORIDA 549 between the Everglades and the surrounding country, and a difference oftwo feet in water level means the difference between shallow lake anddry land for hundreds of square miles. No two of the maps of Floridaagree either in the number, position, or outline of the lakes of the Ever-glades because of the variation in these features with the height of thew^ater. Much of the eastern and northern shore of Lake Okechobee is bor-dered by cypress swamps, some of these containing the tallest cypressesto be found in Florida. On the east the Everglades are bordered by. Fig. ?Swamp lands of the United States with degrees of swampiness shown in two shadings.(Gannett, U. S. Geol. Surv.) prairie and cypress swamps; in a few places patches of hardwood growon slight elevations on the western border of the Everglades. Here arelow irregular elevations, measured by inches, that diversify the distribu-tion of water and sedge; here, too, are narrow winding sloughs some ofwhich extend for miles. Lake Okechobee itself is drained by a canal through the saw grass to Lake Hicpochee andthe Caloosahatchee River. It is also drained by a few short streams that flow southwardfrom the southern edge of the lake but are closed up after a few miles by thick growths of sawgrass. The flatness of the Everglades may be appreciated by the elevations as determined atdifferent times, which run from 6 to 23 feet in various portions, and it has been stated that thedamming up of t
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