ECONOMICAL GEOLOGY. 
183 
the analysis does not look half so poor as the soil is in fact. It consists 
however of rounded and smooth grains of wind-drifted sand, mainly of 
white quartz, but partly also of particles of marine shells, and black iron 
sand. II is an analysis by Dr. Emmons from the sand hills of Bladen 
near Elizabethtown. This, it will be seen, is sterility itself. And yet 
even such lands, mainly through the force of their subsoil, often produce 
certain kinds of plants very well ; for example, the scnppernong, the 
cassena, and the ground pea. 
The precedin 
g examp 
cs are all of tran sjoon 
ted soil 
?, belonging 
for the 
most part, to tl: 
ie drift, 
which cons 
ists of the 
debris 
of the olde 
r rocks, 
lying west and 
above. 
Those whi 
ch follow 
are me 
>stly sedentary and 
granitic. 
soi 
LS OF THE 
MIDDLE REGION. 
Tobacco and 
Wheat k 
Soils of Gr 
anville , Orange , Person , Caswell. 
47. 
48. 
49. 
50. 
51. 
52. 
Silica, Insol.,... 
. 94.10 
58.56 
85.70 
79.83 
71.60 
81.35 
“ Soluble,. 
. 1.10 
6.95 
3.77 
3.90 
0.49 
Alumina, 
. 0.71 
( QA 1 Q 
1.90 
5.30 
5.89 
5.94 
Oxide of Iron, . 
. 0.65 
> oU.lo 
1.48 
3.38 
10.59 
3.19 
Lime, 
. 0.13 
3.03 
0.16 
0.07 
0.22 
0.91 
Magnesia, 
. 0.14 
1.42 
0.24 
0.16 
0.25 
0.51 
Potash, 
. 0.07 
0.19 
0.12 
0.10 
0.02 
0. 43 
Soda, 
1.33 
0.69 
Plios. Acid, . . . . 
trace 
trace 
0.06 
0.11 
0.32 
0.11 
Sulph. Acid, . . . 
trace 
trace 
trace 
0.03 
0.04 
0.18 
Chlorine, 
0.01 
trace 
0.02 
0.02 
trace 
trace 
Organic Matter, 
2.40 
4.55 
3.05 
6.25 
5.40 
3.90 
Water, 
0.20 
1.40 
0.45 
0.30 
2.20 
1.70 
Number 47 is a light colored, sandy and gravely soil, from Prospect 
Hill, Orange county, formed by the decomposition of a very quartzose 
felspatic granite. The growth includes several species of oak of moderate 
size, with a few small specimens of hickory, dogwood, sounvood and 
blackjack, and an occasional pine. The sample was taken from the farm 
of Mr. E. Birch, which produces tobacco of the finest quality, which is 
sometimes sold at two dollars a pound. It is evidently a lean soil, and 
the yield is small; though the texture of the leaf is superior. A dressing 
of gypsum and bone-dust would raise the quality of this soil very much 
