which fell near Adair, in the County of Limerick. 21 



to 1.58 grs. ; of this l.Oy? heated to low redness, gave .63 of carbonate of lime. 

 Hence, 



1.07 : .63 : : 1.58 : .93 carbonate of lime, equivalent to .52 of lime. 



The solution deprived of the lime was treated witli carbonate of potash, 

 added in considerable excess, and then evaporated to dryness. Water was now 

 poured on, and the carbonate of magnesia which remained was collected, and well 

 washed upon a double filter. When dried on the sand bath, it weighed 42.79 

 grs. 42.58 were exposed to a red heat, and reduced to 18.60. Hence, 



42.58 : 18.60 : : 42.79 : 18.69 the magnesia. 



The following therefore are the results of our analysis of solution (A.) 



Sulphuret of Iron ... J P ' > 8.75 



^ tiron . . . 5.75/ ' 



Iron =57.95 — 5.75= 52.20 



Nickel 2.28 



Magnesia 18.69 



Lime 52 



82.44 



In this statement the whole of the iron is estimated in the metallic state. A 

 part of it, however, is present as protoxide in the earthy matrix decomposed by the 

 acids, and to determine the relative proportions of it in these two states, it is only 

 necessary to know the total weight of the portion of the aerolith solved by the 

 acids. Now this, as will presently appear, is 84.82 grs., hence, 84.82 — 82.44 

 =2.38 is the excess due to the oxidation of the iron. If then .r=:iron in the 



rtf* 



metallic state, 52.2 — a;=that in the form of oxide, and x-\-{5i'2.2—x) hh must be 



equal to 52.2-1-2.38=54.58, an equation from which we obtain x the metallic 



iron=:43.87; and (52.2 — .*") Hg' the protoxide, =10.71 grs. Substituting then 



these numbers for 52.2, we obtain, as follows, the true composition of the portion 

 of the meteorite dissolved by the aqua regia. 



