GEOGRAPHY OF CENTRAL FLORIDA 187

completeness have been obtained from various sources. The best
seem to be three in the 6th volume of the Tenth U. S. Census (pp. 201, 204, 205, 214), which leave little to be desired except the nitrogen percentages and perhaps more exact information about the topography and vegetation. The samples were collected by Dr.
Eugene A. Smith in the summer of i88o, and analyzed! under his direction at the University of Alabama, by John B. Durrett, by the acid digestion method (described by Hilgard in Tenth Census 5:72, Soils 340-343, and elsewhere). The localities are as follows:
 A. First class pine land, 9 miles north of Ocala, with longleaf pine, red oak, hickory and wire-grass. Depth 10 inches.
 B. Dark gray high hammock soil one mile south of Ocala, with live, white* and water oaks, hickory, bay,$ sweet and sour gum, and magnolia. Depth io inches.
 C. Light gray hammock near Leesburg, with hickory, live and water oaks, red bay, and "evergreen." Depth 8 inches.
 The analyses of these three are given in Table 15, to which sample Q (described farther on) is added for comparison with C. The first is evidently an intermediate condition between the high pine land and the red oak woods described elsewhere. The second

 TABLE 15.
 Chemical Analyses of Four Central Florida Soils.
 Marion Co. Sandy ham'ks
 Pine Ham- Lake Marion
 land mock Co. Co.
 A B C Q
Water and organic matter -----------------------1.884 3.583 1.6751 1.29
Potash (K20) ---------------------------------- .189 .112 .052 .021
Soda (Na2O) ----------------------------------- .038 .035 .015 ?
Lime (CaO) -------------------------------------1 .0721 .185 .077 .06
Magnesia (MgO) -----------------------------1 .0391 .038 .019 ?
"Phosphoric acid" (P20) ------------------------ .110 .110 .079 .074
"Sulphuric acid" (SO3) -------------------------- .091 .054 .053 ?
Brown oxide of manganese (Mn3O4) --------------- .055 .027 .032 ?
Peroxide of iron (Fe2.O) ---------------------- .321 2.048 .214 .415
Alumina (A1203) -------------------------------- .9151 2.494 .628
Soluble silica -------------------------------I 1.6651 1.380) .2141 ?
Insoluble matter ----------------------------- 94.4601 90.5851 97.3501 96.20
 Total -------------------.---------------------I 99.8391100.6461100.40S_ ---*Doubtless Quercus Michauxu.
 tProbably Quercus laurifolia.
 tDoubtless Persea Borbonia.