THE WATER OF SYDNEY HARBOUR. 45 
Water taken from a large underground tank at St. Paul’s 
College during the same period was found to be purer still— 
Free. Albuminoid. 
Tay 15 ere aaaiiy |! annie. igh 028 
Se eas ek ee "OP rr nae "03 
ne Be al a “03 
ammonia in solution ; and that in the case of the latter at least, 
the quantity of ammonia yielded by organic matter was very 
small, 
Ocean water.—To pass now to the water of the ocean. I 
have not had the opportunity of examining water taken from the 
Harbour water.—The difference between the ocean water and 
the water of that portion of the harbour with which we are here 
concerned was found to be very marked. 
a. Blackwattle Cove.—To take first the neighbourhood of the 
bankme t the head of Blackwattle Cove. Samples of 
other words, there was dissolved in these waters an amount 0 
free ammonia from a hundred and ten to a hundred and seventy 
times as great as was found in an equal bulk of most of the 
samples of water from the beach at Waverley. It was soon 
ing into the cove not far from the point at which the water 
had been collected. An examination of the water of this creek on 
er. [Th 
tide notice on that day.] These samples, though differing con- 
siderably from each other, were both very much purer than those 
Pes described. The precise quantities of ammonia were as 
‘ollows ;— 
June 2nd ce ae Se acciee 
4s 6th Shas 
