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1ll
TABLE 32.
Comparison of Means of Analyses made during
1894 and 1895.
Temperature
C0.
Per 100,000 pts. of Water.
Total
Solids.
Organic.
Ammonia.
Nitrogen as
Nitrites and
Nitrates.
Chlorine.
Hardness
1D°=1 pt.
Ca Cos.
Carbon.
Nit'g'n.
West Middlesex
Water Co.
1894
10.9
28.12
0.207
0.024
0.000
0.216
1.9
18.4
1895
9.8
28.57
0.159
0.021
0.000
0.233
1.8
19.3
Grand Junction
Water Co.
1894
12.3
28.96
0.202
0.024
0.000
0.226
1.9
18.9
1895
11.8
28.74
0.147
0.019
0.000
0.239
1.8
19.6
undergone decomposition. Both supplies were
slightly harder last year than in 1894.
From a bacteriological point of view the filtration
during last year was not up to the usual
standard, which fact appears to have been partly
due to the prolonged frost. Last year the average
percentage of microbes removed by filtration was,
in the case of the West Middlesex Company 99.29,
and in that of the Grand Junction Company 97.57.
The corresponding figures for 1894 were 99.65
and 98.06. This is a matter of such great importance
that no apology need be offered for the
inclusion of the appended Table showing the variations
in the number of microbes per cubic centimetre
in the samples examined each month of the
year. (See Table 33, p. 114.)