332 John Casper Branner 



ANALYSIS OF FII.TERED ARKANSAS RIVER WATER, LOW STAGE. 



(Sample collected August 22d, 1888, when the river stood at 2.4 

 feet ou the gage). 



Hypothetical Combination. 



Grains per Per cent, of 

 U. S. Gallon. Solids. 



Silica (SiOJ .85 1.83 



Chloride of sodium . . . . (NaCl) 28.57 61.58 



Chloride of potassium . . . (KCl) .68 1.47 



Sulphate of magnesia . . . (MgSO^) 3.92 8.45 



Sulphate of lime (CaSO^) .75 1.62 



Sulphate of iron (FeSO^) 05 .11 



Sulphate of alumina . . . (ALlSOJj) .38 .82 



Carbonate of lime (CaC03) 8. 47 18.26 



Total, 46.36 100.00 



Found. 



Silica (SiOJ .85 1.83 



Sulphuric acid (SQo) 5.90 12.73 



Carbonic acid (CO/^ 5.08 10.96 



Chlorine (CI)" 17.62 38.91 



Iron (Fe) .02 .04 



Aluminum (Al) .06 .13 



Calcium (Ca) 3.56 7.68 



Magnesium (Mg) .78 1.68 



Potassium (K) .35 .75 



Sodium (Na) 12.14 26.15 



Total solid 46.36 100.00 



It will be noticed that at the low stage of water 61.57 per 

 cent, of the dissolved matter removed is common salt, and 8 

 per cent, is Epsom salt. 



This dissolved matter is invisible and consequently not of a 

 kind to attract so much attention as the mechanical sediments, 

 but the total for a day, a month, or a 5^ear, is an impressive 

 one. The amount carried down in this form from October, 



1887, to September, 1888, was 6,828,350 tons, and averaged 

 569,029 tons per month ; during the single month of May, 



1888, 1,161,160 tons were carried out in solution. When it is 

 remembered that this material has all been dissolved from 



