!Mr Conneirs Analysis of a 



peroxide and protoxide of iron, alumina, magnesia, lime, sul- 

 phuric and muriatic acids. In the course of the following ana- 

 lysis, minute quantities of one or more alkalies will also appear. 

 *^The proportions of these constituents were determined in the 

 following manner : 



{a) S cubic inches of the water were evaporated to dr3mess in 

 a platinum crucible. The reddish-grey residue weighed 45.15 

 grains. 



, (b) S cubic inches were precipitated by ammonia. The pre- 

 cipitate was dissolved in muriatic acid, and the solution digested 

 with excess of potash. The oxide of iron, after being separated 

 by filtration and ignited, weighed 16.64 grains*. 



(c) The alkaline solution, by supersaturation with muriatic 

 acid, and precipitation by carbonate of ammonia, afforded 1.95 

 grains of alumina. 



(d) The liquid which had been precipitated by ammonia in 

 {b) was concentrated by heat, and oxalate of ammonia then added ; 

 the precipitate was collected, calcined, and heated with carbonate 

 of ammonia ; .35 grain of carbonate of lime was thus obtained, 

 equivalent to .195 of lime. 



{e) The liquid separated from oxalate of lime was evaporated 

 t6 dryness, and the residue calcined. A white saline mass was 

 obtained, which weighed 3.05 grains. It dissolved in water, 

 except a few flocks, which, after ignition, weighed .02. 



(/) The filtered solution was precipitated by acetate of baryta, 

 and after the sulphate of baryta had been separated by filtration, 

 the solution was evaporated to dryness, and the residue ignited. 

 The ignited mass was treated with water. To the liquid, after 

 being separated from the undissolved matter, muriatic acid was 

 added. It was then evaporated to dryness, and the matter ob- 

 tained redissolved in water. 



(^) This solution, by spontaneous evaporation, gave a residue 

 exhibiting a very small quantity of minute cubes or square ta- 

 bles, evidently either common salt or chloride of potassium. 

 After the removal by alcohol of a minute quantity of deliques- 

 cent matter which accompanied it, and subsequent ignition, it 



• It retained a,very slight trace of magnesia, which had been thrown, down 

 by the ammonia. 



