66 
THE SOIL OF THE COTTON STATES. 
Potasli 1.000 per cent. 
Soda 0.730 « 
Peroxide of iron and oxide man- 
ganese 4.850 " 
Phosphoric acid 0.310 " 
Sulphuric acid trace. 
Chlorine 0.050 " 
Orenic, apocrenic, and humic acids. 0.400 " 
Insoluble vegetable matter 4 300 " 
100.140 
One thousand grains of this soil, digested with a solu- 
tion of carbonate of ammonia, yield i-^-^ grains of soluble 
matter, four grains of which consist of the organic acids 
of the soil, namely, crenic, apocrenic, and humic acids, and 
nine-tenths of a grain consist of mineral matters — phos- 
phate of lime, sulphate of lime, magnesia, oxide of iron — 
the alkalies, soda and potash, and a little silica. 
This soil has for its mineral constituents the disin- 
tegrated matters from the metamorphic rocks, chiefly 
micaceous and argillaceous slate rocks, the particles of 
mica being unusually abundant, but the argillaceous mat- 
ters in a finely decomposed state, or in the condition 
of clay. 
No. 3. 
Upland Cotton Soil, from near JacTcson^ Mississippi^ the sam- 
ples obtained from the surface to the depth often inches. 
This soil is very fine loam, and, when dry, is almost an 
impalpable dust. One hundred grains of it on analysis 
yielded — 
