352 Mr. C. T. Jackson's Chemical Analysis of Meteoric Iron, 



= 5*750, being placed in a green glass flask, and pure nitric 

 acid poured upon it, no action took place until heat was ap- 

 plied, when a violent effervescence, with extrication of nitrous 

 acid fumes, began, and the solution was rapidly and entirely 

 effected. The solution was then treated with a sufficient 

 quantity of the solution of muriate of ammonia, to prevent 

 the precipitation of the nickel, and then the peroxide of iron 

 was thrown down by means of liquid ammonia. When the 

 precipitate had subsided, the whole was thrown on a filter, 

 and the peroxide of iron was thoroughly washed, dried, ig- 

 nited in platina capsule, and weighed = 23'5 grs. peroxide 

 of iron = 16*296 grs. metallic iron. 



The solution, which had passed the filter, was of a clear 

 blue colour, with a slight amethystine tint, indicative of nickel. 

 This solution and the mingled washings were evaporated in 

 a glass vessel to a small bulk, and then treated, while wai'm, 

 with a hot solution of pure potash, when a dense bulky green 

 precipitate of the hydrate of nickel was thrown down, which 

 being collected on a filter, washed, thoroughly dried and ig- 

 nited in a platina crucible, weighed 8*8 grains = oxide of 

 nickel = 6*927 grains metallic nickel. 



Analysis — 2d specimen. A fragment of the meteorite, 

 weighing 50 grains, was found to have a sp. gr. = 6*500. 



It was placed in a green glass flask, perfectly pure nitric 

 acid was poured upon it, and heat was gradually applied until 

 the solution was completed. It was then diluted with pure 

 distilled water, and a solution of nitrate of silver was added, 

 when an abundant curdy white precipitate of chloride of silver 

 took place. When the operation was complete, I filtered the 

 solution, collected the washed chloride of silver, and dried 

 and fused it in a small porcelain capsule. It weighed = 3 

 grains = chloride of silver = 0*74 gr. chloride, or 0*76 hydro- 

 chloric acid. 



The solution was then cleared of nitrate of silver, by means 

 of hydro-chloric acid, and filtered. Then muriate of am- 

 monia being added, the peroxide of iron was precipitated by 

 pure ammonia, and after washing, drying, and ignition, 

 weighed = 48 grains = 33*28 grs. metallic iron. 



The oxide of nickel was precipitated by means of a solu- 

 tion of pure potash, and when collected, washed, dried, 

 and ignited, weighed 15*8 grains oxide of nickel = 31*6 per 

 cent. = 24*708 per cent, metallic nickel. After the separa- 

 tion of the metallic oxides, the solution was treated by means 

 of a solution of acetate of barytes, and a white precipitate of 

 sulphate of barytes was formed, which weighed, after washing 

 and drying, = 27 grains = 2 grs. sulphur. 



