54 On certain Stony and Metalline Suhjlances. 



quentlv mentioned yielded me 80 grains of oxide of iron from 

 62 of the metal ; which indicates about 7^ of nickel, or about 

 10 per cent. 



Examination of the Siherian Iron. 



100 grains of this iron gave 127 of oxide of iron: hence 

 it (hould contain about 17 percent, of nickel. 



The yellow fubflancc belonging to this iron was analyfed 

 in the fame way as the globular bodies, and the earthy parts, 

 of the ftone from Benares. 



The proportions refulting from the analyfis of 50 grains, 

 and from fome previous experiments on other particles, were. 

 Silica ----- 27 

 Magnefia _ - _ _ i^'- 



Oxideofiron _ _ _ yi 



Oxide of nickel _ _ _ ' 



49r 



'Examhiation of the Bohemian Iron. 



26!- grains of this metal left about i^ grain of earthy 

 matter, infuluble in nitric acid 5 and, by ammonia, afforded 

 30 grains of Qxide of iron, inducing an eflimation of nearly 

 5 ot nickel. 



Examination of Iron from^ Senegal, brought hy General 

 O'Hara, and given to vie by Mr. Hatchett. 



In this experiment, 199 grains of oxide were produced from 

 J45 grains of metal : hence there may be an eftimation of 

 8 grains in 145, or between 5 and 6 per cent, of nickel. 



It will appear, from a collcfted view of the preceding pages 

 and authorities, that a number of ftones averted to have fallen 

 imder fimilar circumftances have precifely the fame charac- 

 ters. The ftones from Benares, the ftone from Yorkfliire, 

 that from Sienna, and a fragment of one from Bohemia, have 

 a relation to each other not to be queftioned. 



J ft, They have all pyrites of a peculiar charafter. 



adly, They have all a coating of black oxide of iron. 



3dly, They all contain an all^y of iron and nickel. And, 



4thly, The earths which ferve to them as a fort of con- 

 ne(5ling medium, correfpoud in their nature, and nearly in 

 their proportions. 



Moreover, in the ftones from Benares, pyrites and glo- 

 bular bodies are exceedingly diftinft. In the others they are 

 more or lefs definite 3 and that from Sienna had one of its 



globules 



