12. T. BUMBLE-THE SOILS OF TEXAS. 
41 
In the black waxy soils the potash is very high, but the phosphoric acid 
is not usually so. The Thorndale soil, No. 25, is typical, and the Collin 
county specimen, No. 26, is from the best of its class. 
• 
25* 
26t 
Insoluble matter. 
67.07 
46.145 
Soluble silica . 
1.38 
17.241 
Potash. 
.38 
.619 
.14 
.186 
Lime . 
8.81 
7.4S4 
Magnesia . 
.839 
Manganese . 
.409 
Iron. 
3.33 
4.216 
Alumina. 
3.18 
11.073 
Phosphoric acid. 
.05 
.151 
Sulphuric acid. 
.14 
.104 
Carl ionic acid. 
4.31 
1.875 
Water. 
3.29 
[ 9.510 
Organic and volatile.. 
8.86 
101.54 
99.852 
* Third Annual Rept., Geol. Sur. Tex., p. 379. 
t Cotton Production, Tenth Census, p. 36. 
Austin Chalk.— The upper portion of this belt, geologically, forms 
waxy soils, which are brown to black when dry, but deep black when wet. 
Toward the interior border of the belt its limestones are more compact 
and* less argillaceous, and form hills and bluffs which furnish only a 
scanty soil, owing to the rapidity with which the disintegrated material 
is removed from the surface. 
In the soils from the chalk the phosphoric acid is higher than that of 
the ckiyK on either side of it, as evidenced by analysis No. 27 of a soil 
from Austin and No. 28 of a soil and subsoil from Waxahachie. 
27 * 
28+ 
Insoluble matter. 
74.58 
59.90 
53.17 
Soluble silica. 
.15 
Potash ... 
.17 
.35 
.41 
j4oda. 
.23 
.04 
.24 
Lime .. 
2.23 
5 17 
10.62 
~M a frncsia.. 
.51 
.67 
1.41 
1 ron . 
3.52 
5.44 
5.18 
Alumina,. 
5.25 
6.81 
6.32 
Phosphoric acid. 
.13 
.15 
.65 
SnInfillrio, a.pifl _ . 
1.47 
.14 
.29 
Oarhonic acid .. 
.33 
j - 11.44 
3 . 9 S 
8.11 
Water .. . 
9.06 
7.64 
Orphan ip. nnrl volatile . 
7.77 
5.80 
100.01 
99.48 
99.84 
* Records Geol. Sur. Tex. P. S. Tilson, analyst, 
f Bulletin 25, Tex. Ag. Ex. Sta., p. 265. 
