312 
GEOLOGY OF NORTH CAROLINA. 
most of the eastern section, will ever be liable to pollution from various 
sources; and the dangers of such pollution are greater, and are contin- 
ually augmenting, especially in cities, as the sewage and decaying animal 
and vegetable matters are continually descending, and will sooner or later 
reach the sources of such shallow wells. 
It will be noted that Nos. 3, 4, 5 and 6 contain an appreciable amount 
of phosphoric acid, especially the last ; this is always objectionable and 
suspicious, even in the smallest cpiantities. No. 7 is an exceptionally 
pure water. The following analyses of polluted and unwholesome 
waters are added, as an illustration of the effect of sewage and ma- 
nure heaps and other animal and vegetable filth, which, without proper 
sanitary precautions, will accumulate in all cities, and even about 
private houses. They are from the last Journal of the Royal Agricul- 
tural Society of England, and were made by Voelker. 
1 
2 
3 
Organic Matter, 
1.56 
2.68 
Phosphoric Acid, 
1 
1 
0.98 
0.17 
Oxide of Iron and Alumina, 
Phosphate of Lime, 
0.42 
0.95 
Sulphate of Lime, 
IS. 14 
20.67 
96.71 
Carbonate of Lime, 
5.41 
11.21 
Carbonate of Magnesia, 
12.81 
Nitrate of Magnesia,. 
S.21 
0.19 
13.93 
Sulphate of Magnesia, 
Nitrate of Lime, 
S.97 
34.83 
Sulphate of Soda, 
3.96 
Chloride of Sodium, 
13.53 
20.44 
45.35 
Alkaline Carbonates, 
2.72 
1.58 
17.86 
Silica, 
0.S4 
1.40 
1.82 
Solid Matter, 
5S.S0 
70.S4 
218.26 
No. 1 was taken from a public pump in the suburbs of London. Dr. 
V. found on inquiry that there was a burial ground in the vicinity, and 
he had no doubt that the drainage from thence reached the well and 
rendered it “ unwholesome and totally unfit for drinking purposes.” 
No. 2 is a sample of water from a well used by a family that had been 
attacked by typhoid fever. Dr. V. says the sample is “ contaminated 
with drainage products, which fully accounts for the outbreak of typhoid 
fever in the family.” 
