168 
GEOLOGY OF NORTH CAROLINA. 
The above table will give an approximately correct view of the 
relative proportions of the different mineral elements removed from an 
acre of soil by some of the principal crops of the State: 
Cotton — Four hundred pounds lint , with 6eeds, stalk, &c. Tobacco — 
Twelve hundred and sixty pounds dry leaves , with stalk, &c. Wheat 
<&c., — entire plant. 
The larger part of this mineral matter is of course found in the stems 
thus, in the case of cotton, the 400 pounds of lint carry off but 7 pounds 
from the soil, the seed not quite 30, the stem having to account for nearly 
300. Tobacco, however, removes two-thirds of the amount credited to 
it, in the leaves, one-third only going to the stem. 
This will suffice to bring into a general view the relations of the ordi- 
nary crops to the composition of the soils on which they are grown, and 
it will serve also to show the relations of fertilizers to soil improvement 
and restoration. 
The soils whose analyses are given below, may be graded, and their 
general character and value ascertained, at least approximately, by refer- 
ence to the above tables ; and the defects of such as are wanting in any 
essential elements, will also be apparent, so that the proper fertilizer will 
be indicated ; and a reference to the following section will show whether 
such defiiciencies may be supplied by the marls, peats, or other domestic 
resources, or whether foreign fertilizers are needed. 
Most of the soils heretofore analyzed, it will be seen, belong to the 
eastern region, a large proportion of them being from some sort of swamp ; 
as this class of land is very extensive, and constitutes altogether the most 
valuable portion of that region. 
SWAMP SOILS OF THE EASTERN COUNTIES. 
Bay River Swamp, Craven County. 
1 
2 
3 
4 
5 
Silica, Insoluble, 
69.28 
62.64 
75.05 
71.24 
71.30 
Silica, Soluble, 
12.05 
3.86 
6.75 
9.95 
5.90 
Alumina, 
4.90 1 
G ££ 
2.94 
7.58 
1.23 
Oxide of Iron, 
1.46 j 
0.52 
1.36 
1.39 
Oxide of Manganese, 
0.64 
Lime, 
0.29 
0.68 
0.15 
0.11 
0.12 
Magnesia, 
0.09 
0.58 
0.03 
0.16 
0.13 
Potash, 
0.24 
0.90 
0.13 
0.08 
0.08 
Soda, 
0.68 
0.16 
0.07 
