78 JOHN C. H. MINGAYE. 
RemMARKS.—Water turbid, due to fine suspended clay. The 
residue strongly darkened on ignition. The total solids largely 
consist of clay, the soluble portions being chloride of sodium, with 
traces of sulphate of lime, nitrates, nitrites, etc. This water in 
its present state is totally unfit for human consumption. The 
sample was taken after the heavy rains experienced in June 1890, 
and the pollution is no doubt due to the water having run off a 
large catchment area carrying impurities from the surface into 
the tanks. A second sample of this water was asked to be 
furnished three months after, which on analysis yielded as follows: 
(6.) Byerock, water taken from Government tank (second sample). 
Results expressed in—Grains per Gallon. Parts per 100000 
Appearance in two feet tube ... Reddish-brown colour 
Odour when heated to 100° F.... nil nil 
Free Ammonia ... ee eh ‘001 i é 002 
Albuminoid Ammonia ... eh OU zl 016 
Nitrogen as Nitrates... dhe trace ioe trace 
Nitrogen as Nitrites... SF, trace Me trace 
Oxygen absorbed in 15 minutes 025 Spf 036 
Oxygen absorbed in 4 hours... ‘081 3h ‘116 
Total solids a ee .. 13104 < \.te RRS Tees 
Phosphoric Acid as Phosphates strong traces 
Chlorine as Chlorides... ... 900° ea 
Loss on ignition... ae Bs 2-128 te 3°040 
RemMarks.— Water of a reddish-brown colour and turbid, due 
to finely suspended clay. The bulk of the total solids consists of 
clay, the soluble saline matter being chloride of sodium, with traces 
of lime, magnesia, sulphuric acid, nitrates and nitrites. The water 
has greatly improved in quality since the previous analysis was 
made, the organic ammonia being only :016 per 100,000 against 
-049 per 100,000 in the previous analysis. 
(7.) Well water from Lewis Ponds near Orange. 
Total solid residue ... ... 93°633 grains per gallon. 
Loss on ignition... ... 27:400 . 
Chiorimetiy ya. ae vont. LADO Ai 
Free Ammonia, ~... ... 0°100 parts per 100,000 
Albuminoid Ammonia ve -040 i 
