904 



Qualitative Examination of the Native Copper found on Round Is- 

 land in the Cheduba group South East of Ramree, and forwarded 

 to the Society by Captain Campbell, See Proceedings Asiatic 

 Society for April 1843. By S. Mornay, Esq. 



H. Torrens, Esq., Secretary of the Asiatic Society of India. 



My dear Sir, — I have great pleasure in handing you the result of 

 the examination I have made, at your suggestion, of the Copper from 

 Flat Island. 



My own business has occupied me so much lately, that I have had 

 very little spare time to give to the investigation, or I should have 

 finished it much sooner. Your most obdt. servt. 



S. Mornay. 



A qualitative Analysis of Native Copper found on Flat Island, in the 

 Bay of Bengal. 



A piece digested with heat in dilute Sulphuric Acid for several 

 days, left a grey powder undissolved, (residuum No. 1.) The solution 

 was pale blue, precipitated with Bi-carbonate of Ammonia, and re-dis- 

 solved, all the soluble part of the precipitate with Caustic Ammonia. 



In the undissolved part found globules of Mercury, separated them 

 and dissolved the rest in cold Muriatic Acid. The solution was 

 greenish yellow: neither boiling nor diluting with water made any 

 alteration. This solution was affected by reagents, as follows : — 

 Caustic Potash — White, permanent. 

 Caustic Ammonia — White, ditto. 

 Carb. of Soda — Snow white. 

 Hyd. Sulp. of Amm. — Green black. 

 Ferro-chyaz. of Potash — Dark blue (whole mass coagulated.) In 



some experiments this reagent merely 

 changed the color of the solution to a 

 dark olive green, owing to the acidity 

 of the solution. 

 Tincture of Galls — Brown, 

 it therefore contained Titanium. 



