CHEMICAL COMPOSITION. 



43 



No. 874. Powhatan water, Ballston, Va. 

 [Sodic and calcic bicarbonated alkaline (silicious).] 



Gases (number of cubic centimeters per 1,000 grams at 0C. and 760 mm pressure). 

 Carbon dioxid (free), 6.7; carbon dioxid (set free from bicarbonates on evaporating 

 to dry ness), 2.2. 



HYPOTHETICAL FORM OF COMBINATION. 



a Faint trace. 



