24 



M. Lowe's Analyses of 



98.17 95.73 99.50 92.66 



In order to ascertain if the basalts of other districts have a 

 similar composition, I undertook the analysis of a very charac- 

 teristic Silesian variety, which was kindly given me by Professor 

 G. Rose, who also permitted me to perform the process in his 

 laboratory. The locality of the specimen employed was Wicker- 

 stein, near Querbach, in Lower Silesia. Its colour was greyish- 

 black, and it contained pretty large crystals of augite, together 

 with imbedded grains of magnetic iron-ore. The crystals of 

 augite were easily distinguished from the basis by their higher 

 lustre ; and were made particularly apparent on the decomposed 

 surface, where the basis was rendered white and earthy by the 



