GEOGRAPHY OF CENTRAL FLORIDA 177

etc. The amount of lime in the soil must be comparatively small, for except where the rock outcrops are. very abundant the vegetation does not differ greatly in aspect or composition from that of the non-calcareous flatwoods. Only a small part of this soil is cultivated at present, but it seems to be very well suited for vegetables of many kinds.
 Sand and rock with hiims. The greater part of the soil of the great Gulf Hammock of Levy County (fig 5), and perhaps many other level hammocks, seems to have been originally damp sand with limestone protruding through it, though the relative amount of sand may have been less than in the flatwoods, and indeed without extensive explorations it would be hard to say how much of it belongs to the marly type described a little farther on. Anyway, the dense forests now established in such places furnish their own protection from fire and form a great deal of humus, which differentiates the soil further from that of the flatwoods. 'Mechanical analyses 4 and 5 ("Parkwood fine sandy loam") represent this type pretty well. When cleared it makes a good trucking soil, like the preceding.
 Clayey soils. A little north of the center of Marion County, particularly around Burbank, there are a few square. miles of flatwoods with decidedly clayey soil. This type has been seen by the writer only from the train, but its vegetation seems to differ from that of sandy flatwoods chiefly in the scarcity of saw-palmetto. The land has been utilized to some extent for truck-farming. Toward Silver Spring this passes into a sort of low hammock with short-leaf pine and cabbage palmetto,* somewhat suggesting a river or creek bottom. This last, represented by mechanical analyses 44 and 45, is called "Fellowship clay" in the soil survey of the "Ocala area," though it bears little resemblance to anything around Fellowship P. 0., which is on the uplands in a different region, several miles away.
 Marly soils. On and near Merritt's Island there are considerable areas of damp or wet marly soils, whose texture, composition and depth are little known. The vegetation is mostly of the type designated farther on as palm savanna. Some similar vegetation, presumably indicating similar soil conditions, occurs in the Gulf hammock region within a few miles of the coast, 'for example be*Described in 7th Annual Report, pp'. 178-179.