420 Frogresa oj foreign !6cieiice. 



lyses all concurred very nearly as to the proportions of the con- 

 stituents, which are, 



Silica 40 



Oxide of iron 23.5 



Oxide of manganese .... 6.5 



Alumina 10.4 



Lime 9.2 



Chromium 1.0 



Magnesia 0.8 



Sulphur 0.5 



Potash 0.2 



Copper 0.1 



Indispensable loss 3.0 



Loss from unknown causes . . 4.8 



100.0 



This remarkable loss, instead of the usual increase of weight, 

 in the analysis of meteoric stones, by the oxidation of the metals, 

 has led M. Laugier to infer that the iron and manganese are 

 here in the state of oxides ; and there is no particle of this me- 

 teorolite, when pulverized, which is attractible by the magnet. 

 This aerolite seems identical in its composition with the aerolite 

 ofJonzac. The complete absence of nickel, the almost total 

 disappearance of the sulphur and the magnesia, which are re- 

 placed by an abundant quantity of lime and alumina, establish 

 between these stones, and the aerolites previously known, very 

 marked differences. 



A third example of this peculiar composition is presented in 

 an aerolite, which fell in the neighbourhood of the village of 

 Lontola, in the government of Wibourg, in Finland. M. Nordens- 

 kiold, mining engineer at Abo, a pupil of Berzelius, found no 

 nickel in it, and hardly any metallic particles attractible by the 

 magnet. 



M. Laugier here concludes with still more certainty than he 

 did in 1820, that chromium is the most constant character of 

 aerolites. 



The most numerous and best known meteoric stones have 

 more solidity than these new ones. Globules of iron are found 

 in them, which resist the pestle, and are attracted by the mag- 

 net. The latter are friable, easy to pulverize, presenting no 

 obstacles in the mortar, and contain no globules of iron. Their 

 small cohesive force seems to arise from the interposition of 

 different foreign bodies, such as felspar or amphig^ne. They 

 are, however, less homogeneous in their structure, than those 

 first known. Ann. de Ch. et de Phys. xix. 264. 



[The late arrivalof the Foreign Jouriicils has prevented us from arranging 

 iheir contents iii a methodical order.] 



