THE Sheffield Sewage Works were opened in the year 1886, and were JL designed entirely for the lime precipitation process, without any provision for land filtration. At the time the system was approved by the Authorities, and it was hoped a solution of the sewage problem had been reached so far as Sheffield was concerned. It is not the object of the author to recount the phases through which the sewage question has passed since the date when the Shefl'lelci works were opened, but very shortly

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... ter he first occupied his present office in 1888 the question of more effectual treatment was raised. Various steps were taken to improve and perfect the system of purification for which the works were constructed, and in 1897 experiments in biological treatment were commenced.