160 MR. J. P. JOULE ON THE UTILIZATION, ETC. 
The sewage thus pumped to be discharged into tanks, 
and then conveyed to a railway to be carried to reservoirs 
situated at convenient localities in the country. 
Each tank might have a capacity of ten tons, and would 
then hold the contents of five cesspools. It might be 
drawn by a traction steam-engine, which also might be 
employed for the pumping. The discharge pipe of the 
force-pump, as well as its piston-rod, might rise to the 
level of the street, and the requisite connexions be screwed 
or clamped on when required. Immediately after empty- 
ing the cesspool a portion of McDougall and Smith’s dis- 
infecting powder* might be thrown in. This, acting on 
the sewage at an early period, would, Dr. Smith states, 
have the best effect in deodorizing, and in preserving the 
fertilizing property. 
I believe that in the above way Sicip sewage of London 
might be conveyed to the fields, and a very large annual 
profit realized, instead of the dead loss of three millions 
sterling, which must be incurred if the plan of the Metro- 
politan Board is carried out. The other advantages would 
consist in,— lst: Easy construction and repair. 2nd: 
Total prevention of infiltration of sewage, and the effects 
of accumulations of noxious gas. 3rd: Rapid removal of 
sewage before decomposition has had time to take place. 
4th: An unpolluted river. 
* Sulphite of magnesia and lime, and carbolate of lime, 
