95 
case was it sufficiently high to indicate, of itself, drainage contami- 
nation. Phosphoric Acid was present in all, except the Whitehaven 
and Arlecdon waters; heavy traces were found in those of Maryport 
‘and Cleator Moor. Nitric Acid was, like the Chlorine, also small 
in amount; the Millom and Cleator Moor waters being again 
those which contained the most. The Ammonia was also small 
in quantity: the Whitehaven and Keswick samples containing 
none. The quantity of Albuminoid Ammonia is in no instance 
large, although Millom and Cleator Moor are again favoured, and 
Maryport is not far behind. We find that no Oxygen is absorbed 
by any of the waters in two minutes. The amount absorbed in 
four hours is greatest in those of Maryport, Millom, and Cleator 
Moor. Lastly, the microscope revealed vegetable debris and 
Diatoms in nearly all; and moving organisms were found in the 
Millom water. 
By placing a certain value upon each of the constituents thus 
determined, as suggested by the ‘“‘Water Committee” of the Society 
of Public Analysts, we obtain a sum which enables us to classify 
the waters, with comparative ease; of course, the lower numbers 
denote the purer waters. They are arrived at in the following 
manner. 
The smell may be valued from o to 8. 
The appearance, from o to 4. And 
The microscopical appearance of the deposit, from o to Io, 
according to the discretion of the analyst. 
The Chlorine found is multiplied by 2. 
The Phosphoric Acid traces are valued at 2; heavy traces, at 4 
very heavy traces, at 8. 
The Nitrogen, as Nitrates, is multiplied by ro. 
The Ammonia is multiplied by 200. 
The Albuminoid Ammonia is multiplied by 1000. 
The Oxygen absorbed in two minutes is multiplied by 500. 
The Oxygen absorbed in four hours is multiplied by roo. 
The Hardness, before and after boiling, are added together, 
and then divided by 5. 
The Total solid matter is divided by 5. 
