Annual Report on Adulterations, 8,'c. 237 
The clear filtered water left on evaporation, when dried at 300° 
Fahrenheit, 17 - 87 grains of dry residue, which, on analysis, 
produced : 
Organic matter 2"12 
Oxides of iron and alumina, with traces of phosphoric acid *07 
Silicate of lime 1'85 
Carbonate of lime 4 - 36 
Carbonate of magnesia 2*81 
Carbonate of potash '66 
Carbonate of soda 3*26 
Chloride of sodium 2*30 
Sulphate of potash '93 
Nitrate of potash "18 
The proportion of soluble matters in this specimen of Nile- 
water, it will be seen, is very trifling. On the other hand, it 
contains a good deal of carbonate of soda and magnesia. When 
filtered, and deprived thereby of its sediment, which appears 
to be mainly instrumental in renewing the fertility of the land, 
Nile-water is wholesome and agreeable to the taste. 
The second specimen of Nile-water was taken at the height of 
the flood, and distinguished from the first sample by a bright, 
almost blood-red colour. 
On standing for a considerable length of time it lost its colour, 
and deposited per imperial gallon, 87*51 grains of solid matter, 
which consisted of — 
Mineral substances (extremely 'fine clay and sand, con- \ o-i.nn 
taining a great deal of oxide of iron) : .. / 
""Organic matters 5*85 
87-51 
♦Containing nitrogen *26 
Equal to ammonia "31 
The filtered and clear water on evaporation and drying at 
300° Fahr., furnished 11*88 grains of solid residue per imperial 
gallon. This residue, on analysis, yielded — 
Organic matter l - 54 
Oxides of iron and alumina, with traces of phosphoric acid 1'04 
Carbonate of lime 1*41 
Silicate of lime 3 - 87 
Sulphate of lime T32 
Chloride of sodium '79 
Carbonate of soda "48 
Nitrate of potash *84 
Carbonate of magnesia 1*15 
The red colour of this Nile-water I find not to be due to 
organic matter, but to extremely finely-divided oxide of iron. 
This red peroxide remains in suspension for weeks together, and 
thus imparts a bright red colour to the water. , 
