264 Description and Analysis of a Meteoric Stone. 



separated the metallic part by a magnet ; I poiinded it a se- 

 cond time to separate more earth : this process was repealed 

 until I obtained the iron as free from martial pyrites and 

 earthv particles as possible in this mechanical way : it 

 weighed thirty-five grains : muriatic acid was poured on it, 

 and digested nearly in a boiling heat until every thing so- 

 luble was taken up. 1 filtered the solution, and the inso- 

 luble part when washed and strongly ignited weighed 9'25 

 grains. I precipitated the iron with carbonate of ammonia, 

 then boiled the mixture to separate the whole of the iron : 

 when cold it was filtered, and the iron washed and ignited 

 weighed 28 grains. The filtered liquor was evaporated to 

 dryness, and the salt was again dissolved in distilled water. 

 On standing some time, light brown flocks, which showed 

 no vestige of nickel and very little of iron, were deposited; 

 the quantity was so small it could not be weighed. The 

 solution when filtered was very clear, and of a slight green 

 colour: on dropping a solution of potash into it the colour 

 changed to blue, and bv continuing to add the alkali a pre- 

 cipitation took place. This precipitate when collected on 

 a filter was of a pale trrcen cc^lour, and ihe filtered liquor was 

 quite colourless. Hydro-sulphuret of ammonia produced 

 no precipitation in this liquor; which convinced me, con- 

 trary to wliat was expected, that the whole of the nickel 

 had been thrown down by the potash, The green precipi- 

 tate, dried as much as possible on the filter, weighed four 

 grains and a quarter, and was of a deep apple-green colour. 

 When ignited it w ei<rhed only three grains. Pure ammonia 

 was poured on it, which by means of a moderate heat dis- 

 solved the whole of the nickel : the solution was of a purple- 

 blue colour, and one grain and a half of magnesia was 

 left behind. 



The remainucr of the 100 grains, the pyritic and earthy 

 parts (65 tirains), were treated with muriatic acid in the same 

 way. The insoluble earthy part weighed 39 grains, and 

 the oxide of iron 11 grains. The magnesia was thrown 

 down bv potash, and wlien ignited weighed 7 grains and a 

 half. The liquor after the magnesia was separated was quile 

 colourless; and sulphuretted hydrogen, alihough it con- 

 tained free ammonia, produced no'precipitarion. A quarter 

 of a crain of nickel was separated froni the magnesia by 

 means of ammonia. 



.It remained now to ascertain the quantity of sulphur: 

 for this purpose JOO grams of the stone were reduced to 

 coarse po.vder : on this a larger quantity of strong muriatic 



acid 



