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13
This is a clear and bright water free from odour and
taste. It is of a very high degree of bacterial purity, and is
therefore a pure and wholesome water suitable for drinking
and domestic purposes.
The sample from the Canal Service main gave the following
results
Number of organisms per cubic centimetre of water
growing upon, nutrient gelatine at 20° C. in three
days 320,000
Number of organisms per cubic centimetre of water
growing upon agar at 37° C. in one day 16,600
Smallest quantity of water giving acid and gas in bile-
salt glucose broth 0.001 cc.
Smallest quantity of water giving gas in bile-salt lactose
broth 0.001 cc.
Smallest quantity of water containing the Bacillus Coli 0.001 cc.
Smallest quantity of water giving the reaction of the
B. Welchii (Bacillus Enteritidis Sporogenes) 1.0 cc.
This is a grossly polluted water teeming with bacteria of
which large numbers are of intestinal origin. It resembles a
sewage effluent, and it would seriously contaminate any
drinking water to which it gained access, even when greatly
diluted.
Samples of water were submitted to Mr. S. H. Johnston, M.Sc.,
of St. Bartholomew's Hospital, especially for the presence or absence
of the Salmonella Group.
His reports were as follows :—