306 Scientific Proceedings, Royal Dublin Society. 
from the tank into which the sewage is pumped previous to its 
discharge into the Lough on the ebb tide. Three samples were 
employed, each of which was filtered previous to its employment. 
The following determinations were made :— 
FILttERED SEWAGE. 
In parts per 100,000. 
Number 
of Nitrogen as— 
Sample. | Total Solids. 
Free NH3. | Albd. NH3. | Total. 
1 | 469°8 1°82 1°15 2°97 
2 243°7 1:25 0:59 1°84 
3 93°5 0°33 1°32 1:65 
Experiments in Closed Vessels. 
Three series of experiments were made, all at the same tem- 
perature, viz. 21°C., and with the same proportions of sewage and 
sea-water, viz. 1 part by volume of the former, and 99 parts of the 
latter. 
In the first series, No. 1 sample of sewage and No. 1 sample of 
sea-water were employed. In the second series, No. 2 sample of 
sewage and No. 2 sample of sea-water; and in the third series 
No. 3 sample of sewage and No. 3 sample of sea-water. 
In the following table we give the results of the different 
determinations. 
