4 8 
W. B. ALEXANDER, M.A. : 
The pond in which I obtained ray specimens seems to have 
been salter than that from which the German naturalists obtained 
theirs, since Mr. Simpson states that the water is too saline for 
even stock to drink. The figures given are : total solids 1.40 
per cent., chlorine 0.69 per cent. (Cf. sea water : total soldis 
3.5 per cent.) 
In a third very salt pond on the far side of the Hannans’ 
Battery workings I collected numbers of two species of water- 
beetles",* but saw no other animals. The water from this pond 
contained 9.03 per cent, total solids and 5,06 per cent, chlorine. 
The samples I collected were too small for complete analysis, 
but the following results of an analysis of Hannan’s Lake water, 
made by Mr. Simpson in 1899 give an idea of the relative quantities 
of different salts in the waters of this lake : — 
Potassium chloride 
strong 
trace 
Sodium chloride 
12.837 per 
cent. 
Magnesium chloride 
1.926 
) > 
Magnesium sulphate 
492 
> y 
Calcium sulphate 
39 8 
y, 
Calcium carbonate 
.005 
} y 
Silica 
.005 
y y 
Alumina 
.004 
y y 
Total solids 15-667 
Total chlorine 9.213 
X ecterosoma regulare Sharp and Berosus sp. 
