Use of Toivn Sewage as Manure. 
153 
No. 1.— Seweu Water from Barrett's Court. 
An imperial gallon contained — 
OF substances in solution . . . 243 -30 grains. 
Of insoluble substances . , . , 248 "96 „ 
No. 2. — Sewer Water from Dorset Square. 
The imperial gallon contained — ■ 
Of substances in solution , . . 109 "00 grains. 
Of insoluble substances .... 100' 70 ,, 
The following tables give the composition of the liquid and 
solid matter of these specimens of sewer-water. 
The insoluble and soluble matters are both capable of sup- 
plying nitrogen or ammonia to vegetation. The solution contains 
the nitrogen in the form of ammoniacal salts, and it is a circum- 
stance of great interest and practical importance that all the 
nitTogen in the liquid state seems to be in the form of ammoniacal 
salts — the urea and other animal products having rapidly passed 
into this condition. The insoluble matter contains, of course, no 
ammoniacal salts, its nitrogen being referable to unchanged 
animal matters. The quantity of ammonia in the soluble and 
insoluble state in a gallon of sewer-water, calculating the nitrogen 
of the solid matter £is if it had passed into ammonia, is as 
follows : — 
Ammonia in a gallon — 
In the soluble state . . , 36*72 grains. 
In the insoluble state , . , 4"56 
Analysis of Sewer Water. — No. 1. From Barrett's Court. 
An Imperial Gallon 
contains (in grains 
and ten 
ths)— 
Solu 
ble. 
Insoluble. 
Both. 
Organic Matter and Salts of Ammonia 
121 
•50 
180 
•32 
301 
82 
Sand and detritus of the Granite from the) 
*1 
39 
19 
30 
20 
69 
1 
•57 
10 
94 
12 
51 
7 
•71 
2 
73 
10 
44 
10 
71 
4 
02 
14- 
73 
11 
62 
3 
97 
15 
59 
50 
17 
03 
24 
53 
2 
87 
Traces. 
2 
87 
Peroxide of Iron and Alumina .... 
Traces. 
6 
20 
6 
20 
46 
91 
1 
22 
14 
13 
1 
51 
1- 
51 
31 
52 
1 
72 
33 
24 
243 
30 
248 
96 
492 
26 
* This is some small proportion of insoluble matter escaping the linen filter, 
and properly belonging to the other column. 
