158 ON STONY AND METALLINE SUBSTANCES 



This ha ex- From the above obfervations, it will not be difficult to con- 



W of h nat?vT" Ceive ' the P offibi % ofthe t0( al, or nearly iota!, deftruciion of 

 iron, «ec. the tranfparent fubftance ; and alfo, the appearance the pieces 



of iron mutt naturally prefent, when deprived of it. I cannot 

 help obferving likewife, that there appears to cxift a very in- 

 terefting analogy, between thefa tranfparent nodules and the 

 globules I defcribed as making part of the ftones faid to have 

 fallen on the earth. This analogy, though not a very ftrong 

 one, may lead us to fuppofe that the two Jubilances are fimilar 

 in their nature, but that the globales are lefs pure, and con- 

 tain a greater quantity of iron. 



The Bohemian The native iron from Bohemia is a compad mafs, fimilar to 



iron infome , • ^ /*,,,•. . 



meafure refem- the compact part of the large ipecimen of iron from Siberia, 



bles the Sibe- which has juft been defcribed : like that, alfo, it contains a 



number of globular bodies or nodules- but they are not in. 



fuch great proportion as in ( the Siberian iron. They are be- 



fides perfectly opaque, and .very much refemble the moft com- 



pa& of the globules belonging to the ftones faid to have fallen 



on the earth. 



EXAMINATION OF THE IRON FROM SOUTH 

 AMERICA. 



S.American iron I have already obferved, that my experiments coincided 

 contains 10 per ^ jtfi thofe of Mr. Prouft. He obtained 50 grains of fulphate 



of .nickel, from 100 of this mafs. The procefs Ihavefofre- 

 ' quently mentioned, yielded me 80 grains of oxide of iron from 



62 of the metal ; which indicates about 1\ of nickel, or about. 



10 per cent. 



EXAMINATION OF THE SIBERIAN IRON. 



Siberian iron 17 100 grains of this iron, gave 127 of oxide of iron : hence, 

 per cent. &c it fhould contain about 17 percent, of nickel. 

 The yellow mat- The yellow fubftance belonging to this iron, was analyzed 

 ter. 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, 



Silic* 



