Avoirdupois, Source ofthe Chelsea. In the City of Grand Junc- Source of the At its source New-York as at 62° Fah., Chelsea Wa- CrotonLake it issues from tion Water ter WorkB or 70, grs. Avoirdupois. Works Com- the pipes. pany. Company.

Grains. Grains. Grains. Carbonate of Lime,. ----„- 16-000 Grains. 16-500 1-42 1-52 Sulphate of Lime, > •00 •44 Chloride of Sodium, J 3-400 2-900 Oxide of Iron, 1 Silica, 1 very minute Ditto. •34 •46 Magnesia, portions.

Carbonaceous Matter, J Chloride of Magnesium, ) •86 •90 Chloride of Calcium, / Carbonate of Magnesia, - - - - - •70 •84

Solid matter held in solution, -'-'--' 19-400 19-400 2-98 3-70 0-368 0-238 •34 •46

Total solid matter, 19-768 19-638 3-32 416

Analysis of the Croton and Schuylkill waters, by J. C Booths Professor of Chemistry to the Franklin Institute of Pennsylvania, and H. M. Boye, of Philadelphia.

Croton Water. Schuylkill Water. In 100 parts gr. in 1 gall. In 100 parts gr. in 1 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 Jive