partlcularhj mar Lcdgle, in Hie Department oJVOrm. 301 



of them at tlie time found them very warm ; and that to 

 judf-e bv the number collected, and by the, extent of lihe 

 ground on which they were found, an astonishuig quantity 

 must liave fallen. _ , r 



These stones in general are irregular, polygonal, otten 

 cuboid, sometimes sub-cuneiform^ and exceedingly various 

 in their diameters and weight; they are all covered with 

 a black gravellv crust consisting of a fused matter, and tilled 

 with sniall aei^lutinated orains of iron. The greater part ot 

 kiiem are broken at the corners, cither by their shock against 

 each other, or bv talliuo- on hard bodies. The interior part$ 

 resemble those of all the stones analysed by Messrs. Howard 

 and Vauquelin ; thev are gray, a little varied in their shades, 

 granulated, and as i't were scaly, spht m many points, and 

 tilled with brilliant metallic points exactly of the same as- 

 pect as those of other stones of the like kind. 



In conjunction with C. Vauquelm I analysed them m 

 the foUowino- manner, which has been already employed on 

 similar occasions : The stone being reduced to hue powder, 

 we poured over it muriatic acid somewhat weakened. A 

 pretty strong; effervescence was produced ; an odour ot sul- 

 phurated hvdro<ren oas \\ as disengaged, and the liquor as- 

 sumed a veiy ?vidt^it green colour : the gas collected was 

 not entirely sulphurated. Muriatic acid was twice in suc^ 

 cession poured over it to dv prive of its colour the insoluble 

 part, which after being wlII washed was found to be pure 

 silex, forming more than half of the whole weight of the 

 stone. The°muriatic solution with excess of acid was 

 treated with ammonia, which precipitated from it the ox- 

 idated iron, and retained the magnesia and the nickel, ihe 

 iron was completelv separated by boiling the liquor, and 

 nearly 36 per cent, of that metal, weakly oxidated, was ob- 

 tained. The liquor, containing a triple muriate oj ammo- 

 nia, nickel, and masnesia, was mixed with a solution ot 

 bota.sh to precii3itate"lhe mairnesia, which carried witJi it a 

 «nall portion o'f nickel. Nearly 9 per cent, of magncsian 

 earth was obtained. The water charged with sulphurated 

 hvdrogen was after-A ards employed to separate the oxjde ol 

 nickel'^ of which we found about 3 per cent. 



I shall omit saving any thing here of some ditticulties 

 which occurred in the details of this analysis : as 1 reserve 

 these for a particular memoir, I shall content myselt with 

 announcing the result of the analysis. It gave us as tttc 

 constituent maicrials of the stone of Laigle the iollowmc 



proportiuna nearly : Q'Iax 



