1866.] Composition of the Dhurmsalla Meteoric Stone. 215 



muriatic acid, and conducting the sulphuretted hydrogen into an ammo- 

 niacal solution of sulphate of copper, so as to form a black precipitate of 

 sulphuret of copper, there were found by the usual methods 14-8 grs. of 

 sulphate of barytes. 



There were left, after treatment with iodine, muriatic acid, and carbonate 

 of soda, 38'3 grs. of the 100 grs. originally acted upon. 



From the foregoing facts, we readily obtain — from treatment with iodine 

 and for sulphur — 



grs. grs. 



Peroxide of iron 9"85 .... 6*88 iron 



Protoxide of nickel .... l'9b' .... 1*54 nickel 



Sulphate of barytes .... 14"80 .... 5*61 protosulphuret of iron. 



Hence we find, as the primary analysis of the meteorite — 



I. Primary Analysis. 



1. Metallic iron 6-88 



2. Metallic nickel 1*54 



3. Magnetic pyrites .5*61 



4. Earthy mineral (soluble) 47"67 



5. Earthy mineral (insoluble) 38-30 



100-00 



The results of the analysis of the soluble portion (considering that 5-61 

 of Fe S is equivalent to 5* 10 of Fe2 O3) give the following : — 



II. Earthy Mineral (soluble^. 



grs. 



1. Silica 18-95 



2. Alumina 0-14 



3. Protoxide of iron. ... 8*10 



4. Protoxide of manganese 0-66 



5. Lime none 



6. Magnesia 18-34 



7. Potash 0-04 



8. Soda 0-13 



9. Loss 1-31 



per cent. 

 39-75 



0- 29 

 16-99 



1- 38 



38-47 

 0-10 

 0-28 

 2-74 



100-00 



47-67 



Adding together the oxygen of the protoxides, we find — 



RO 19-537 



SiOg 20-637 



A1„0, 0-135 



20-772 



Oxygen. 



20-637 

 0-135 

 3-768 

 0-308 



15-374 

 0016 

 0-071 



40-309 



From the preceding result, it is evident that the soluble mineral in this 



VOL.. XV. T 



