_Croton Water._ _Schuylkill Water._ In 100 gr. in 1 In 100 gr. in 1 parts gall. parts gall. Carbonate of Lime, 45.86 2.293 53.67 2.190 Carbonate of Magnesia, 18.78 .939 11.87 0.484 Alkaline Carbonates, 16.57 .828 4.53 0.185 Alkaline Chlorides, 3.87 .193 3.75 0.153 Oxide of Iron, 2.21 .110 Silica, 7.18 .359 9.68 0.395 Organic Matter, 5.53 .276 0.88 0.036 ------ ----- Parts, 100.00 grs. 4.998 Alumina and Oxide of Iron, 1.88 0.077 Alkaline Sulphates, 13.74 0.560 ----- ----- Parts, 100 grs. 4.080 The Croton water was taken from the Croton dam, and when perfectly clear was found, as appears by the above analysis to contain 4.998, or about _five_ grains of solid matter to the gallon. The Schuylkill water was taken from the middle basin on Fair Mount, and contained 4.08 grains of solid matter to the gallon. The Croton differs from the Schuylkill water in containing a larger amount of the alkaline carbonates, and of the carbonate of magnesia, while it contains less carbonate of lime, and is entirely destitute of the alkaline sulphates, of which the Schuylkill contains 13.74 parts in 100 of the total solid matters, though amounting to only one half a grain to the gallon.