190 Miscellaneous Intelligence. 



The mode of analysis was by successive treatment with 

 alcali and acid. The stone from Jouzac, thus examined, gave 

 no nickel, aiid when other essays were made to discover this 

 metal, they all failed. Hence it is concluded that there was 

 none in the stone, and from the facility of finding the metal 

 when present, there can be no doubt that the conclusion is 

 well founded. 



It is composed of Oxide of Iron 36 



Silex 46 



Alumina 6 



Lime 7.5 



Oxide of Manganese . . 2.8 



Magnesia 1.6 



Sulphur . . ,, 1.5 



Chrome 1 



102.4 

 the excess resulting from oxidation of the metals. 



All the meteoric stones which Mr. Laugier examined, were 

 found to contain chromium. He first found it in the stone from 

 Verona, which fell in 1663, and it was not long before its exis- 

 tence was ascertained in the stone from Moravia, which contains 

 a -^-^ part. It was found too in the native iron of Siberia. 



In testing for the chrome M. Laugier observes, that " if 

 muriatic acid be immediately added to the alcaline solution, 

 there remains no symptoms of the chrome ; but that, if before 

 adding the acid, the alcaline solution be boiled with access of 

 air, and long enough to precipitate all the oxides of maganese 

 and iron, the yellow colour of chromate of potash will remain, 

 however small its quantity, and nothing is required afterwards 

 but to saturate the alcali by nitric acid, and to add a solution 

 of nitrate of mercury." 



It results from M. Laugier's experiments, that among the 

 meteoric stones known, one contains no nickel, whilst all contain 

 chrome ; and hence he concludes that of the two, chrome is the 

 most important character. — Memoires du Museum, vi. p. 233. 



