66 FLORIDA GEOLOGICAL SURVEY—FOURTH ANNUA LREPORT. 
Analysis of Virgin Rolling Pine Land, Soil and Sub-soil, of the Lake Region. 
Soil. 
Sub-soil. 
Coarse earth . 
7.16 
Fine earth . 
. 91.17 
92.84 
Humus . 
.17 
Nitrogen . 
.0014 
Moisture . 
.1000 
Analysis of the Fine Earth: 
Insoluble residue . 
. 97.4560 
98.3770 
Potash (K.,0) . 
Trace 
Soda (Na,0) .. 
.0344 
Lime (CaO) . 
.0000 
Magnesia (MgO) . 
.0261 
.0117 
Ferric Oxide (Fe 2 0 3 ) ) 
Alumina (A1 2 0 3 ) ... j 
.3487 
.4678 
.1912 
Phosphorus pentoxide (Po0 5 ). 
.0272 
.0176 
Chlorin . 
. Trace 
Trace 
Sulphur trioxide (S0 3 ). 
.0000 
Carbon dioxide (CO.,). 
...0000 
.0000 
Water and organic matter. 
. 2.0140 
1.0194 
Total . 
.100.0270 
100.0000 
FLATWOODS. 
The term “flatwoods” is applied to pine lands which are more 
level and consequently less well drained than the rolling pine lands. 
PALMETTO FLATWOODS. 
A widely prevailing type of country in parts of peninsular and 
west Florida is that which may be designated from its characteristic 
vegetation as palmetto flatwoods. The native timber growth is pine 
of several species, among which the long leaf or yellow pine, Pinus 
palustris predominates, although in the southern part of DeSoto 
County the species is replaced by the Cuban pine, Pinus caribaea. 
The characteristic undergrowth is wire grass and the saw palmetto 
(Serenoa serrulata).' The palmetto flatwoods are in general level 
and sometimes so flat as to be more or less flooded during the rainy 
season. These overflows, however, are temporary, as the palmetto 
will not withstand excessive or prolonged flooding. The smaller 
streams are bordered by more or less swamp of hardwood growth. 
The larger streams as a rule are confined to definite channels in the 
palmetto flatwoods, have sandy banks and are not bordered by 
swamps other than the alluvial swamps of the rivers. Small circu- 
