78 
Utilisation of Town Sewafjic. 
acre field are given in Table I., p. 89, and those of the samples 
from the ten-acre field in Table II,, p. 90, in the Appendix.] 
*' A summary of these, with an additional column, showizig 
the constituents in 1000 tons of sewage, is given in Table \T. 
below; and the results as there recorded will be sufficient for 
consideration on the present occasion. There are there given 
the mean composition per gallon of the 12 samples from the five- 
acre field, of the 12 from the ten-acre field, and of the 24 
samples ; also the amount of each of the several constituents in 
1000 tons of the sewage-water according to the mean of the 
24 analyses. 
" Table VL— Showing the mean Composition per gallon, and per 1000 tons, 
of the Sewage-water. 
Sevex irtfSTHS — April to October inclusive, 1861. 
Mean Grains per Gallon. 
Lbs. 
Const! taenta. 
12 Samples 
from the 
5-acre Field. 
12 Samples 
from the 
10-acre Field. 
The 
24 Samples. 
per 1000 J 
Tons. 
Organic matter 
' In solution 
In suspension 
10-26 
16-75 
10-30 
11 '.57 
10-28 
14-16 
329 
4.53 
Total .. 
27-01 
21-87 
24-44 
782 
Inorganic matter 
' In solution 
In suspension 
36-82 
16-18 
35-85 
12-55 
36-34 
14-36 
1163 
459 
Total .. 
53-00 
48-40 
50-70 
1622 
Total solid matter 
80-01 
70-27 
75-14 
2404 
Ammonia .. .. 
' In solution 
In suspension 
4-99 
1-65 
4-98 
1-18 
4-98 
1-41 
159 
45 
Total .. 
6-64 
6-16 
6-39 
\ 
204 
1-12 
0-87 
0-95 
0-99 
1*04 
0-93 
33 
30 
" Reference to the Appendix Tables will show that the com- 
position of the sewage differed very much indeed, and pretty 
equally so in the two fields, at different periods of the season^ 
depending upon the amount of water reaching the sewers, and 
the consequent state of dilution of the sewage. The Table given 
* " The potass and phosphoric acid were determined in two samples only in each 
ca«e." 
