which fell near Adair, in the County of Limerick. 23 



residue having been now steeped for some hours with as much muriatic acid as 

 was sufficient to moisten it, was then treated with distilled water, and collected on 

 a double filter, on which the silex was washed, until the solution which passed 

 through ceased to precipitate nitrate of silver. When dried upon the sand 

 bath it weighed 94.71 grs. ; 91.03 of this were reduced by a red heat to 66.87. 

 Hence, 



91.03 : 66.87 : : 94.71 : 69.57, the silex in the 102.47 of insoluble matter. 

 And, 102.47 : 69-57 : : 1 15.18 : 78.19, the total quantity of silex in (B). 



To the washings of the silex, which were conceived to be sufficiently acid to 

 admit of the omission of the sal-ammoniac without incurring the danger of pre- 

 cipitating any magnesia, caustic ammonia was added in excess, which threw down 

 peroxide of iron, oxide of chrome, and with them what proved afterwards to be 

 magnesia. These were collected as usual, and washed on a double filter, and 

 when dried by a sand heat they weighed 31.37 grs. 



The washings containing the magnesia with a trace of lime were boiled with 

 carbonate of potash, and the whole being evaporated to dryness, and water again 

 poured on, the precipitate was collected, and well washed on a pair of filters. 

 When dried at 212° it weighed 38.17 grs. Of this 36.40 by a strong red heat 

 were reduced to 17.40. Hence, 



36.4: 17.4:: 38.17:18.24. 

 And 102.47 : 18.24 :: 115.18 : 20.50, the mixed magnesia and lime in (B). 



Of the mixture of peroxide of iron and oxide of chrome with trace of mag- 

 nesia, amounting to 31.37 grs., 31.07 were dissolved in muriatic acid, and mu- 

 riate of ammonia being first added, the peroxide of iron and oxide of chrome 

 were again thrown down by ammonia, which left the magnesia in solution. The 

 oxides were collected, and washed on a single filter, and the washings, when 

 boiled with carbonate of potash, gave a deposit of carbonate of magnesia, which, 

 when washed, and dried at a sand heat, weighed 4.11 grs. 3.45 grs. of this were 

 reduced by a red heat to 1.99. Hence, 



3.45 : 1.99 :: 4.11 : 2.30, magnesia in the 31.07 grs. 

 And 31.07 : 2.30 :: 31.37 : 2.32, magnesia precipitated with the oxides. 

 And 114.12 : 2.32 :: 115.18 : 2.34, magnesia to be in this step obtained from B, 

 the unsolved portion of meteorite. 



