Mineral JVaters at Cheltenham. 23 



Experiment XX. — The water which had been acted on 

 by acetate of barytes in the preceding process, after having 

 been filtered, became strongly milky on letting fall into it a 

 few drops of acetate of silver : the precipitate was soluble in 

 liquid ammonia. 



Experiment XXI. — Acetate and nitrate of lead, added in 

 the proportion of one grain to tlie cubic inch of the saline 

 water, occasioned a white cloud. 



Experiment XXII. — Five grains of phosphate of soda pro- 

 duced no change in two cubic inches of water highly con- 

 centrated ; but an abundant precipitate ensued when one cubic 

 nich of a neutral solution of carbonate of ammonia was added. 

 Experiment XXIII. — One cubic inch of fresh prepared so- 

 lution of hydro-sulphuret of strontia, agitated with ten of 

 water highly cwicentrated, instantly occasioned much pre- 

 cipitate. 



Experiment XXIV. — Twelve grains of crystallized acetate 

 of lime effected no change in four cubic inches of saline 

 water. If the same quantity of nitrate of lime was added 

 to three cubic inches of the water concentrated by boiling, 

 a copious white powder fell down. 



Experiment XXV.— Five cubic inches of alcohol, min- 

 gled with ten of strongly concentrated saline water, occasion- 

 ed an abundant crystalline precipitate. 



Experiment XXVI. — Four grains of arseniate of potash, 

 dissolved in four cubic inches of the water, produced no 

 change after having been suffered to stand 2-i hours. 



Experiment XXVII. — Five grains of crystallized potash 

 rendered three cubic inches of the water turbid ; a floccu- 

 lent precipitate floated on the surface, after suffering the 

 mixture to stand undisturbed for six hours. 



Experiment XXVIII. — Tincture of galls, either prepared 

 with or without alcohol, produced no sensible change, whe- 

 ther in the fresh or boiled water ; but if to one cubic nich of 

 water, concentrated by evaporation, three grains of oxy- 

 muriate of potash and six of nitrous acid were aJdcd, tinc- 

 ture of galls and succinate of sorla then produced a dark- 

 coloured precipitate. 



Erpcriment XXIX. — Neither prussiate of potash nor 

 B 1 prussiate 



