ECONOMICAL GEOLOGY. 
215 
to 10.72 per cent., and its per centage composition is given in the next 
column, No. 11. 
There is another valuable ingredient of this sea weed, not given in the 
above analysis of the mineral contents. The organic constituent includes 
9.2 per cent, of nitrogenous matter, which is important as a source of 
ammonia. 
The other column, A, of the table, gives the analysis of dried lish, 
from which the oil has been removed. It is from the New Jersey Geo- 
logical Report, and was made for the purpose of showing the fertilizing 
value of this fish-refuse, which is a very important resource of the farmers 
within reach of the large fish-oil manufactories of the New Jersey and Long 
Island shores. The per centage of nitrogen is 7.72. The proportion of 
oil obtained from the fresh fish is 3.9 per cent. The species of fish is the 
same which is so abundant in the sounds of North Carolina, called here 
the fat-back , — the menhaden or white fiJi of the more northern coast. The 
analysis of the refuse and offal of the fisheries would not differ materially 
from this. So that here is evidently another most important and 
abundant source of manure to the eastern farmer, and a suggestion of 
profitable enterprise to the manufacturer also. 
Japan Clover . — The analyses given below are inserted mainly for the 
purpose of showing the comparative fertilizing value of this plant, which 
has lately attracted much notice, both in this state and elsewhere: 
12 
B 
C 
Silica, 
1.02 
0.15 
0.28 
Oxide of Iron and Alumina 
0.07 
Lime, 
0.99 
1.92 
1.S6 
Magnesia, 
0.69 
0.38 
Potash, 
0.88 
1.95 
1.07 
Soda, 
0.09 
0.26 
Phosphoric Acid, 
0.39 
0.56 
0.3S 
Sulphuric Acid 
0.20 
0.17 
0.28 
Chlorine, 
0 02 
0.21 
0.30 
Organic Matter, 
7S.05 
S0.75 
Water, 
11.30 
16.00 
14.30 
No. 12 is an analysis 
of the ash of Japan clover, which 
might b. 
Oder be 
called Carolina clover. 
As this plant has 
been scattered 
very wide 
!y over 
the state, from the Cape Fear to the French Broad, and has supplanted 
to a considerable extent, the broomsedge of the old fields in many sec- 
tions, it is an important question whether it has any advantage over its 
