338 



The portion insoluble in iodine was now acced on with dilute mu- 

 riatic acid, and gave the following results : — 



Grs. 

 12-92 

 0-15 



g ,g_ ( present originally as protoxide^and 

 ( protosulphuret of iron. 



0-50 

 38-00 

 0-45 

 0-42 

 0-05 



Silica, ...... 



Alumina, 



Peroxide of iron, 



Carbonate of lime, . 

 Pyrophosphate of magnesia, 

 Potash and soda chlorides, . 

 Platino-chloride of potassium, 

 Oxide of manganese (MnsO-i), 



On treating another 100 grs. of the stone for sulphur, with muriatic 

 acid, and conducting the sulphuretted hydrogen into ammoniacal solu- 

 tion of sulphate of copper, so as to form a black precipitate of sul- 

 phuret of copper, there were found by the usual methods 10-7 grs. of 

 sulphate of barytes. 



There were left, after the treatment with iodine and dilute muriatic 

 acid, 42-1 grs. of mineral, insoluble in these reagents. 



From the solution by iodine, and the determination of sulphur, as 

 sulphate of barytes, we obtain — 



Peroxide of iron, . 

 Protoxide of nickel, 

 Sulphate of barytes, 



Grs. 

 27-95 



1-20 

 10-70 



Grs. 

 19-57 iron. 

 0*94 nickel. 



4-05 protosulphuret of iron. 



Hence we obtain, as our primary analysis of the Dundrum Meteoric 

 Stone — 



I. — Primary Analysis of Meteorite (A.). 



1. Metallic iron, 19*57 



2. Metallic nickel, 0*94 



3. Magnetic pyrites, 4 '05 



4. Mineral soluble in dilute muriatic acid, . . . 33*34 



5. Mineral insoluble, 42*10 



100-00 



The analysis of the earthy mineral soluble in dilute muriatic acid 

 gives us (considering that 4*05 of EeS is equivalent to 3-68 of Fe 2 0 3 ) 

 the following result. 



II. Soluble Mineral (A). 







Grs. 



Per Cent. 



Oxygen 



1. 



. 12*92 . 



. 38*74 . 



. 20*112 



2. 





0*15 . 



0*45 . 



0*209 



3. 



Protoxide of iron, 



5*51 . 



. 16*55 . 



3*671 



4. 



Protoxide of manganese, . 



0-05 . 



0*15 . 



0*033 



5. 





0*28 . 



0-84 . 



0*340 



6. 





, 13*65 . 



. 40*93 . 



. 16*358 



7. 





0-08 . 



0*24 . 



0*039 



8. 





0*17 . 



0*51 . 



0*130 



9. 





0*53 . 



1*59 









33*34 



100*00 



40*892 



