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was so great, that there was still a large surplus, which, 
running down along the railroad caused a nuisance that was 
much complained of, and an indictment was threatened 
against the board of management. In this difficulty, a tank 
was built of 9 inch brickwork, 20 feet long, 6 feet wide, and 
4 feet deep, with an inlet from the sewer near the top, and an 
outlet at the other end on a level with the bottom. At 3 
inches from the bottom is placed a moveable floor of 3 inch 
planks, with a number of holes bored through them. On 
this floor alternate layers of peat charcoal and clay ashes are 
placed. The sewerage enters the tank at the top of these 
layers, soaks through them, and passes out at the bottom in 
a stream of pure, inodorous water. At the end of about three 
weeks the tank ceases to act, when the clay ashes and char- 
coal are removed, and a fresh supply put in. The material 
removed is perfectly inodorous, has increased from four to 
eight tons, and is now a valuable manure which fetches a con- 
siderable price. The nuisance complained of no longer 
exists." In May, 1854, Mr. Yarrow states, " I am in- 
formed by Mr. West wood, the bailiff at the farm attached 
to the North Surrey District Schools, at Anerley, that the 
tank, which I constructed there in 1852, continues to act in a 
very satisfactory manner, and that the sewage is perfectly 
purified." 
APPLICATION OF PEAT CHARCOAL AS MANURE. 
The results of trials with peat charcoal as a manure are 
very conflicting and very difficult to reconcile ; serving to 
shew us that we have yet very much to learn with regard to 
the action of artificial manures. Peat charcoal alone does 
not appear to be of value as a manure commensurate with its 
cost, and it will be necessary to reduce the cost of the manu- 
facture of this article very considerably, before any extensive 
applications of it, mixed with night soil and other refuse 
