172 FLORIDA GEOLOGICAL SURVEY-I3TH ANNUAL REPORT

and "St. Lucie fine sand" in Hernando County (1915), "St. Lucie, sand" and "St. Lucie fine sand" in the "Indian River area" (1915), and "St.rQi-e i g i9rg g yh/g.18). Some
ever, rather than different interpretations on the part of the soil surveyors.
 This sort of soil is represented in the tables a few pages farther on by mechanical analyses 37, 38. 46 and 47, and chemical analyses D and K (which unfortunately are incomplete). As compared with other soils of the area it is very poor in potash, clay, humus, and animal life, and it seems likely that in some cases at least it has been derived from the creamy sand next to be described by longcontinued leaching out of soluble materials, a process which in the creamy sand seems to be constantly counteracted by animal agencies, as explained on the next page. Just what keeps these animals out of the white sand remains to be explained; but it may be that they are very slowly encroaching on it year by year.
 The vegetation -on the white sand on uplands is nearly always of the scrub type, described farther on in the chapter on vegetation Where it is low and flat, however, it may bear vegetation of the flatwoods type, with pines and saw-palmetto predominating; and there are various intermediate conditions. Whether the white color extends down only a few inches or several feet does not make as much difference in the vegetation as one might imagine; which seems to indicate that the top soil is more important to plants thav the. subsoil.
 In the interior this soil is almost never cultivated, but along the east coast great quantities of citrous fruits and pineapples and even some vegetables are raised on it, of course with the aid of liberal applications of fertilizers.
 Creami-colored sand. This is by far the most extensive type of upland soil in our area, especially in the lime-sink and lake regions It includes most of the. "Norfolk sand," "Norfolk fine sand" and "Norfolk sandy loam" and some of the "Gainesville fine sand" of the government soil surveys, and is represented in the tables by mechanical analyses 6-9, 27, 28, 39, 40, and chemical analyses E.
-F, L and M.
 It consists of medium to fine-grained incoherent quartz sand, with 3 to 8% of silt and clay, and is usually very homogeneous to a depth of several or many feet, so that few if any roots go all the