IjS Utsearches respecting the Action of 



turated with caustic ammonia, and divided into two equal 

 parts. The one was mixed with muriate of" baryt, and 

 showed no sign oF precipitation even after several days. 

 The other was mixed with a sokilion o? acetate ot" lead, 

 without the least appearance of phosphat of lead. 



That the cast iron did not contain any chrom, f found 

 when a portion of the cast iron, oxidized with nitric acid, 

 from experiment second, was heated in a platina crucible 

 with caustic potash. The solution thereof in water was at 

 first green, but soon precipitated a little manganese, and 

 became colourless ; nitrate of the black oxide of mercury, 

 after the saturation of the alkali by nitric acid, left a 

 scarcely discoverable colourless precipitate, which, on being 

 heated iu a small crucible of oold bv a blow-pipe, vola- 

 tilized without residue, and was derived from a small quan- 

 tity of muriatic acid in the alkali made use of. 



Thus, according to the last described assay, this cast iron 

 consisted of 



Metallic iron, contaminated with the bases of 



silica and magnesia 91'53 



Metallic manganese 4*57 



Carbon 3-90 



100-00 



Cast iron p'oduces when dissolved in acids 0'0065 of its 

 weight, or somewhat more than | per cent, of silica, and 

 0'002, or 4- per cent, magnesia. I could not find therein 

 any traces of lime, or of alumine, although their presence 

 was on good reasons expected. I am inclined to believe 

 that the existence of oxygen in cast iron is by this analy- 

 tical investigation now satisfactorily refuted, since the 

 quantity of carbon compensates for all the deficiency of 

 nieial, and since it is certain beyond dispute, that cast iron 

 does not contain the earths of magnesia and silica, but the 

 metalline bodies which constitute their bases. 



XLVL Researches respecting the Action of Benzoates luitk 

 the earthy and metallic Salts. By W. Hisinger*. 



jL ROFEssoR J. Berzelius having suggested in his Treatise 

 on the Sebacic And t, that the benzoates, like the succi- 

 nates, might with certainty be cu)ployed, under similar cir- 

 cumstances, for separating iron and manganese from their 



* From /IfhantUin-rriT i Fh'jxik, Keiii och Mineralogieulgifne nfW. Hisinger 

 •ch F. Berzciiu.i. 3 K. Stockholm. 1810. 

 + Loc. (it. viil. i. p. 17 1 & teij. 



solutions ; 



