ECONOMICAL GEOLOGY. 
307 
. Many of the springs of these sections have become noted places of 
resort. 
No general investigation of the subject has been yet attempted, and so 
no general discussion will be entered on here. But a great many partial 
analyses have been made, of waters from every section, of which a few 
examples will be given. 
The figures represent the number of grains of the different substances 
found in a United States standard gall 
on. 
1 
2 
3 
4 
5 
6 
7 
Organic and Y ol. Matter, 
5.16 
5.79 
1.23 
1.79 
1.02 
3.95 
1.23 
Silicic Acid, 
1.65 
3.76 
0.62 
1.60 
2.10 
1.01 
1.15 
Oxide of Iron, ] 
3 80 
0.86 
0.74 
0.92 
0.60 \ 
0.14 
0.11 
Alumina, f 
0.18 j 
0.11 
Lime, 
4.80 
1.17 
0.49 
1.72 
1.62 
1.74 
0.19 
Magnesia, 
0.49 
0.06 
0.12 
0.25 
0.42 
0.75 
0 10 
Soda, 
0.27 
1.09 
0.89 
Sulphuric Acid, 
0.25 
1.23 
0.12 
0.74 
0.12 
0.40 
0.08 
Oldorine 
0.92 
0.18 
0.37 
0.37 
0.42 
2.62 
0.17 
Carbonic Acid, 
23.40 
32.22 
large. 
0.82 
0.54 
Phosphoric Acid 
1.00 
Solid Matter , . ... . 
17.07 
13.05 
3.69 
7.69 
6.75 
12.70 
4.03* 
No. 1 is the famous “ Alum Spring,” Onslow county, described on page 
12. The water issues, clear and strong, from an aperture in the limestone 
of about the diameter of a flour barrel, and discharges, at a rough esti- 
mate, 2,000 gallons per minute. There is a decided smell of sulphur in 
the air about the spring, discernible at the distance of several rods ; but 
this ingredient, being in gaseous form, is evanescent, and hence does not 
appear in the analysis. There is a ochreous precipitate for some distance 
along the brook below. 
No. 2 is a similar spring, not so large, but still very bold and copious, 
situated some four miles north of Washington, known as “ Cowhead 
Spring.” The temperature is 60°. This also gives an iron precipitate. 
No. 3 is one mile above Morganton, on the railroad. 
No. 4 is called “Glen Alpine Spring,” some ten miles south of Mor- 
ganton, in the South Mountains. 
No. 5 i6 a spring near Greensboro, analyzed for Dr. Duffy. 
Add .21 grain of sulphur, in the form of sulphides. 
