1T0 
GEOLOGY CF NORTH CAROLINA. 
Sulphuric Acid, 0.22 0.14 0.18 
Chlorine, 0.06 trace 
Organic Matter, 20.80 27.40 15.40. 
Number 6 is from a cypress swamp on Major Blount’s farm, very dark 
to black, with much half decayed vegetable matter, soil 3 to 4 feet deep, 
growth large cypress, poplar and tupelo : when fresh brings 50 bushels 
of corn to the acre, and is very durable. A is a similar 6oil from the 
same plantation analyzed by Dr. Emmons. 7 is from a field which had 
been reclaimed from a swampy condition and cultivated, chiefly in corn 
for many years ; the sample was selected from a small spot of about a 
quarter of an acre in the middle of a field which had within a few years 
ceased to produce, the corn frenching, as it is called, after growing to the 
height of 6 or 12 inches. The analysis does not indicate the cause ; if the 
iron had been separated from the alumina, perhaps the cause would have 
appeared in a deficiency of the former. 
This Blount’s Creek swamp is quite flat, and requires much ditching ; 
it is also quite extensive, and includes several grades of swamp land, much 
of it more sandy, and more elevated and with much less vegatable matter, 
and no cypress. 
Open Ground Prairie Swamp , Carteret County. 
8 
9 
B 
Silica, Insoluble, 
“ Soluble, 
80.84 
3.70 
1.52 ) 
0.00 f 
32.50 
Alumina, 
2.69 
0.39 [ 
o r\f\ 
Oxide of Iron, 
1.18 
0.15 j 
Lime, 
0.44 
0.36 
0.65 
Magnesia, 
0.22 
0.14 
0.30 
Potash, 
0.07 
0.06 
0.07 
Soda, 
0.02 
0.13 
Phosphoric Acid, 
0.08 
0.06 
Sulphuric Acid, 
0.06 
0.00 
trace 
Chlorine, 
0.02 
trace 
Organic Matter, 
7.70 
87.25 
52.70 
Water, 
2.50 
9.60 
11.20 
Number 8 is from the margin, — the oak fringe of this great swamp, 
near North River, about 8 miles north of Beaufort; it is light gray to 
ash-colored, with a growth of white oak, gum, maple, pine and palmetto ; 
the situation is low and flat. This marginal belt of semi-swamp is from 
