If it can be proved to them that Nature is not sure and true enough in its methods, the Authors are prepared to assist it with methods and means produced by the inventive brain of man. But if such proof is not forthcoming, they adhere—in preference to groping in the dark—to Nature’s own methods, knowing from experience, that when allowed full scope and fair treatment, it is most sure in all its ways. That will not prevent them, however, from giving in the future, as they have done in the past, the question of sewage treatment in all its aspects their most careful consideration. ALFRED S. JONES. H. ALFRED ROECHLING. LONDON: _September 15, 1902_. [1] ‘Sewage Treatment: Science with Practice.’ By Colonel A. S. Jones, V.C., C.E. Read at the International Engineering Congress at Glasgow, 1901. And ‘The Sewage Question during the Last Century.’ Read by H. Alfred Roechling, M. Inst. C.E., F.G.S., F.S.I., etc., on December 2, 1901, before the Society of Engineers, and awarded the Gold Medal of the Society. CONTENTS. PART I. BY LIEUT.-COLONEL ALFRED S. JONES, V.C. PAGE INTRODUCTORY 1 THE CHEMIST DIBDIN DISCARDS CHEMICAL PRECIPITATION IN FAVOUR OF M. PASTEUR’S AEROBIC ORGANISMS 3 THE CLEANLY AND THE DIRTY (SEPTIC) PROCESSES FOR SLUDGE REMOVAL 5 THE BEST POSSIBLE MEDIUM FOR AEROBIC ORGANISMS TO WORK IN 5 TABULAR STATEMENT DERIVED FROM THE LEEDS OFFICIAL REPORT OF EXPERIMENTS 7 THE WREXHAM SEWAGE FARM 8 THE CAMP FARM, ALDERSHOT, TO WHICH SIX OTHER AREAS OF SEWAGE WORKS HAVE BEEN ADDED FROM JULY 28, 1902 9 EVIDENCE AND REPORTS OF LORD IDDESLEIGH’S ROYAL COMMISSION, 1898-1902 15 AUTOMATIC APPLIANCES FOR SEWAGE AND EFFLUENT DISCHARGE 17 SLUDGE TREATMENT 19 CROPPING A SEWAGE FARM 21 IMPORTANCE OF HAVING TIDY CONTOUR CARRIERS ACCURATELY LEVELLED 23 SUMMARY OF THE EXPERIENCE OF A LIFETIME 23 ANTICIPATION OF A COMING REACTION AGAINST OVER-RIDDEN “FADS” AND TOO MUCH PRESSURE IN SANITATION 25 PART II. BY H. ALFRED ROECHLING. I. INTRODUCTORY REMARKS 28 II. THE SEWAGE QUESTION DURING THE LAST CENTURY: A SHORT RETROSPECT 29