On the Depth and Saltness of the Ocean. 33 



evaporated in a counterpoised platina capsule and weighed 

 — dissolved out in acidulated water, and precipitated the lime 

 by oxalate of ammonia — filtered, dried, ignited, adding a few 

 drops of the carbonate of ammonia, and weighed, which gave 

 the quantity of carbonate of lime, from which the calcium 

 and chloride of calcium was calculated. The magnesia was 

 then precipitated by phosphate of soda and ammonia, filtered, 

 dried, ignited, and weighed ; from the resulting biphosphate of 

 magnesia, the quantity of chloride of magnesium was calcu- 

 lated. 



" The matter insoluble in absolute alcohol was dissolved 

 in hot distilled water, and the part insoluble in water was 

 ignited, dissolved in acid, filtered, and added to the aqueous 

 solution. To this added ammonia, which threw down the phos- 

 phates filtered, dried, ignited and weighed. To the solution 

 then added oxalate of ammonia, to precipitate the lime, fil- 

 tered, dried, ignited, and weighed ; from the carbonate was 

 calculated the lime. To the remaining solution phosphate of 

 soda and ammonia was added, which threw down the mag- 

 nesia, — filtered, dried, ignited, and weighed ; from which cal- 

 culated the magnesia. 



" A separate quantity of the water was operated on for the 

 sulphuric and carbonic acids and chlorine. To the water was 

 added baryta solution, which threw down the sulphuric and 

 carbonic acids — filtered, washed slightly, and rapidly dried, 

 ignited, adding a few drops of carbonate of ammonia, and 

 weighed, then dissolved in muriatic acid, which dissolved the 

 carbonate of baryta, leaving the sulphate — filtered, dried, 

 ignited, and weighed ; from the sulphate of baryta the sul- 

 phuric acid was calculated. 



" Subtracting the weight of sulphate of baryta from the 

 sum of the weights of the sulphate and carbonate, gives the 

 quantity of carbonate, from which the carbonic acid is calcu- 

 lated. To the solution, after separating the sulphuric and 

 carbonic acids, and the excess of baryta, a few drops of nitric 

 acid were added, then nitrate of silver, which threw down the 

 chlorine, — filtered, washing with acidulated water, dried and 

 weighed, from the chloride of silver the chlorine was calcu- 

 lated. 



VOL. XLV. NO. LXXXIX. — JULY 1848. C 



