E. T. DU5IBLE-THE SOILS OF TEXAS. 
49 
ance is a black sanity, sometimes waxy soil, which is similar to if not 
identical with that of the Reynosa of the Coastal Slope. There is also a 
red loam, which very closely resembles some of the valley soil of the 
Colorado and Brazos rivers, and finally a loose red sandy soil. Of three 
former varieties the subsoils are practically the same materials as the soil 
itself. The last, however, has various subsoils, being in some measure the 
product of the winds. 
The adaptability of these soils for fruit farming and grazing purposes 
has been fully demonstrated, and although the rainfall is sometimes defi¬ 
cient, the porosity of the soil is such that the greater amount of that 
which does fall finds its way downward until stopped and held by the 
impervious bed of clay which underlies the plain, tvlience it is accessible 
by means of wells and pumps. The little irrigation that has been done 
by means of pumping this water has been very successful. 
Seymour Plateau.— The soil of this plateau might almost be classed 
among the drift soils of the area but for its extent and importance. It 
is a rich brown loam, whose great fertility is due to the many different 
beds which have furnished their portions of its materials. It is as near 
an ideal soil as can be found, and with proper water supply will be one 
of the most fertile soils of the State. 
Similar soils are those of Lipan Flat, etc. 
We have only a single analysis of Plains soil, and that is from Carson 
county. It is as follows: 
44* 
Insoluble matter.... 
Soluble silica. 
Potash. 
Soda. 
Lime.■. 
Magnesia. 
Iron. 
Alumina. 
Phosphoric acid.... 
Sulphuric acid. 
Water. 
Organic and volatile 
76.17 
.16 
.06 
.11 
.78 
.51 
4.08 
6.08 
.09 
.34 
6.01 
4.50 
* Records Geological Survey of Texas. P. S. Tilson, analyst. 
100.87 
Residual Soils of the Mountain Regions. 
CENTRAL MINERAL REGION. 
The soils resulting from the weathering of the granites and other sili¬ 
ceous rocks of this district are red loams, varying from sandy to clayey, 
and are of excellent quality where they lie in bodies of sufficient extent 
for tillage. 
