XII. J. M. SMAIL. 



that in laying out the city the mistakes of the past may be avoided. 

 One of the most serious troubles in connection with carrying out 

 a sewerage scheme is the absence of lanes or drainage reserves. 

 The lines of subdivision appear to be laid out with total disregard 

 to requirements of a sewerage system. Also that the anomaly of 

 a building act being in force in the city, and the total absence of 

 one in the suburbs, may not be repeated. The control of civic 

 affairs could be consolidated under one body without interference 

 with efficiency of administration. The future Federal City con- 

 cerns every person in the Commonwealth both as to position and 

 internal administration, and it is to be hoped that with its advent 

 the ideal civic government may be attained. 



SOME NOTES ON THE PURIFICATION OF SEWAGE. 



By J. G. S. Purvis. 



[Read before the Engineering Section of the Royal Society of N. S. Wales, 

 July 17, 1901.'] 



In reviewing the progress that has been made in the purification 

 of sewage I purpose confining myself to the treatment that has 

 been meted out to the sewage arriving on the Sewage Farm at 

 Botany and Arncliffe from the Southern and Western Systems. 



The sewage of Sydney has four principal outfalls — The Northern 

 System discharging at Ben Buckler, Bondi ; the Southern dis- 

 charging on to the Sewage Farm at Botany; the Western discharg- 

 ing on to the western end of practically the same farm at Rockdale, 

 while the sewage of North Sydney is discharged at Willoughby 

 Bay, Middle Harbour. 



The sewage falling into the Northern System is discharged into 

 the Pacific Ocean at Ben Buckler, without any previous treatment. 

 The sewage falling into the Southern System, in addition to the 



