154 Use of Town Sewarje as Manure. 
Analysis or Sewek Water. — No. 2. From Dorset Square. 
An Imperial Gallon 
contains (in gi 
ains 
and tenths) — 
Soluble. 
Insoluble. 
Both. 
Organic iVlatter <inu osilts ol Aininonia. • • 
57 
32 
23 
00 
80- 
32 
SciDd and detritus of the Granite from tliel 
0 
44 
50 
28 
78 
45 
1 
16 
12 
09 
13 
25- 
2 
53 
1 
64 
4 
17 
0 
28 
3 
63 
3 
91 
10 
58 
1 
99 
12 
57 
7 
40 
8 
37 
15 
77 
07 
Trace. 
07 
Peroxide of Iron and Alumina . • . . 
Trace. 
2 
66 
2 
66 
2 
60 
0 
72 
3 
32 
27 
27 
2 
•10 
9 
37 
109 
•00 
100 
•70 
209 
70 
Ammonia : 
In the soluble state . ... 15' 16 grains. 
To be formed from the insoluble matter . 2-80 ,, 
It will be observed that the water from Dorset-square con- 
tains less than one-half the quantity of soluble and insoluble 
matters found in the other specimens, and the quantities of 
ammonia and phosphoric acid are in the same proportion. The 
first sample, however, contains a wonderful excess of potash — a 
circumstance in great measure due to the influx of water from 
the streets, which is, as I have already stated, highly charged 
with salts of potash derived from the granite. 
On the whole these analyses bear out the anticipation which 
we should form upon theoretical grounds, namely, that the 
principal part of the matters important to vegetation — the 
ammonia, the phosphoric acid, and the alkaline salts — are to be 
looked for chiefly in the solution. I do not wish for a moment 
to let it be supposed that nothing of value exists in the solid 
matters of sewaofe, or that these matters would be of no use as 
manure. It is simply stated — and this is my first proposition — 
that in n(>glecting tiie liquid we lose by far the largest propor- 
tion of manuring matter ; and I think it possible to show, as my 
second proposition, that the collection of the solid matter will 
not, at the price which the product is agriculturally worth, be a 
vaying speculation. 
Reverting to these analyses, we find that in the first case 89 per 
cent, and in the second 84 per cent, of the total ammonia (nitrogen) 
in the sewage exists in the soluble state. There is no doubt, 
