PROCEEDINGS OF SECTION I, 



677 



peaty^pulverent matter whicli contained a small amount of organic 

 nitrogen and some very minute particles of coke dust. After separa- 

 tion the different portions were dried down at 100° C, and the moisture 

 estimated by difference. The total amount taken in each case was 

 100 gTammes. 



Table VIII. 



Large coke . . . 

 Fine coke dust 



Residue 



Water 



Sample 1. 



100.00 



Sample 2. 



100.00 



•Including '027 grammes of organic nitrogen. 



Expressing the quantities as percentages of the total dried matter 

 we have • — 



The difierence between the two samples is probably due to the 

 position from where they were taken. Where No. 1 was situated the 

 bed would be walked on and raked over more than at the other point. 

 On the whole, however, it will be seen that considerable degradation 

 of the coke had occurred. 



BALMORAL OUTFALL WORKS. 



These works are the most recent of the three under consideration. 

 They were constructed by the Public Works Department and handed 

 over to the board in July, 1904. Previous to this the department had 

 conducted the working of the installation for a few months, but during 

 this time there was practically no sewage coming in. 



The outfall is situated on the north-west shore of Middle Head, 

 and discharges into Middle Harbor. The installation comprises a 

 small silt bed, four covered tanks, each 28ft. 6in. wide, 68ft. 6in. long, 

 and 6ft. 2in. deep, and containing 75,000galls. The filters are eight 

 in number, each 32ft. wide, 68ft. long, and 4ft. deep, and are con- 

 structed of destructor breeze about 3ft. 2in. deep covered with lOin. 



