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Sewage Sickness in Land Filtration,by J. E. PURVIS,M.A.,Univer sity Lecturer in the Chemistry and Physics of Hygiene,and an Examiner for the D.P.H.,St. John's and Corpus Christi Colleges,Cambridge;A. C. N. McHATTIE,M.B.,Ch.B.Edin.;and R. H. J. FISHER,M.A.,Emmanuel College,Cambridge,M.R.C.S.Eng.,L.R.C.P.Lond