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IN a discussion on Sewage-Disposal, by the American Society of Civil Engineers, Mr. Geo. C. Whipple remarked that England had taken the lead in works pertaining to the purification of sewage ; and he went on to say, " If one asks the reason for this, a fitting reply is found in the old adage : ' Necessity is the mother of invention.' The English rivers are small, the English cities are large and numerous, and the amount of manufacturing carried on in them is very great."If this description be generally correct, it is especially so when applied to Birmingham, which is the most inland of the great towns of the country, is built on high, undulating land between 300 and 600 feet above Ordnance datum, and is within a few miles of the highest reaches of several rivulets which unite a t Saltley to form the River Tame.The normal flow of this river does not exceed 24,000,000 gallons per day-less than the present flow of sewage draining to the Saltley outfall-works, which after entering the river must flow for more than 150 miles before it reaches the sea. HISTORICAL.The works which the Author proposes to describe belong to the Birmingham Tame and Rea District Drainage Board, a joint board

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