GEOGRAPHY OF CENTRAL FLORIDA 191

Brevard Co. Depth 8 inches. Soil mostly sand, but underlaid at no great depth by shell marl.
 East Coast Strip

 Z (2108). Crest of outermost dune, about 10 feet high, about a mile south of Melbourne Beach, Brevard Co. (fig. 33). Depth
6 inches. A fine sand with finely divided shell fragments.
 The analyses of these last twelve samples are given in Table 18. The moisture is that retained by the soil after drying in the open air for several weeks in the dry season, and the volatile matter includes both organic substances (the nitrogen in which is determined separately) and carbon dioxide liberated from limestone., which amounts to considerable in some of the samples. (Any one sufficiently interested can determine approximately from the, lime percentages just how much of the volatile matter is carbon dioxide.) The iron and alumina are combined, on account of the difficulty of separating them, and soda, sulphur, magnesia, manganese, etc., are omitted entirely, because they were not regarded as of sufficient importance to justify the labor of determining them.

 Comments on the Chemical Analyses
 In the first three analyses, made by the acid digestion method, A, from mixed red oak and pine woods, has more potash than any other central Florida soil on record (and the comparison might be extended to the whole State, as long as we have no analyses of the alluvial soils along the Apalachicola River). This soil supports a large proportion of deciduous trees, while on that represented by C, which has less than a third as much potash, the vegetation is nearly all evergreen. Sample Q is probably very similar to C, but the analysis shows considerably less potash on accotint of the different method used. The highest potash percentages in the analyses made by Mr. Heimburger are in the calcareous hammock soils from near Ocala and McIntosh, where deciduous trees greatly predominate.
 Sample R, taken from red oak woods with no evergreens, would almost certainly show more potash than A does'if analyzed by the acid digestion method, but the A. 0. A. C. method does not do justice to the potash. In fact its indications with respect to this con-