which fell near Adair, in the County of Limerick. 26 



8,97 : 3.70 : 9-87 : 4.07 

 the true weight of oxide of chrome in 31.07 out of 31.37 grains of the mixture 

 chrome iron and magnesia ; and therefore 



31.07: 4.07:: 31.37: 4.11 

 And 102.47 : 4.1 1 :: 1 15.18 : 4.61, 



the oxide of chrome in 200 grains of the meteorite. 



The results of the analysis of (B) are, therefore, as follows : — 



Silex 78.19 



Magnesia, a little lime, and a| 

 trace of oxide of manganese/ 



Protoxide of iron 6.98 



Oxide of chrome 4.6 1 



Alkalies and loss 1.48 



115.18 



If we collect from (A) and (B) the silex, the magnesia, the lime, the manga- 

 nese, and the protoxide of iron, deducting from this latter 2.07 grains, the quan- 

 tity associated in the stone with the 4.11 grains of oxide of chrome, we will have 

 for the matrix the following constituents : — 



Silex 78.19 



Magnesia, &c.* 43.13 



Oxide of iron 15.62 



136.94 

 Now if these numbers be divided by the respective atomic weights, we obtain 

 the following results : — 



^^•1^ = 5.04 



15.5 



43.13 

 20.7 



15.62 

 36 



= 2.08 

 = 0.43 



* The lime and manganese being inconsiderable in amount, are incorporated with the magnesia. 

 VOL. XVIII. E 



