46. THE WATER OF SYDNEY HARBOUR. 
B. Glebe Point.—The peninsula of Pyrmont serves to divide the 
system of bays we are considering into two divisions, an eastem 
and a western. One more analysis was made of water collected 
from the shore of the western division. This was taken 
Glebe Point on May 27th, about an hour before low-water. It 
yielded free ammonia ‘25, albuminoid -28. 
y. Wharf, Erskine-street—On the eastern or Darling Harbour 
side of Pyrmont two samples were collected from the shore. Both 
of these were taken from a wharf at the foot of Erskine-street. 
The following results were obtained :— 
Free. Albuminoid. 
May 24th (half an hour afterlow-water) ... ‘66 ... ‘ll 
June 9th 3,  beforehigh-water) ... 34 .. @ : 
The high-water sample yielded only half as much free ammonia 
as the low-water sample ; but in respect to albuminoid ammonia 
the relation was exactly reversed. This may serve to illustrate ie 
the great variations and irregularity in regard to the amount of 
organic matter present in the harbour water. 
56 J, : 
Five days afterwards a sample of water was collected from the 
Glebe Island Bridge, about an hour and a half before low-wate™ — 
le results of these two analyses agreed very closely itt 
subsequent days water was collected from both bridges at from 
dge were :— 
Free. 
f , : ” 17 wee owe wee eee ee 16 
Those for the eastern bridge were— 
Junel2 .. Pe ee ae al nee 
ee ey am 
_ Instead of the close agreement eiteeted we hive here 
oy of the most pronounced and unmistakeable kind. 
