74 PROCEEDINGS OF THE NATIONAL MUSEUM. 



entirely in the graphitic condition. After weiohino- it was ).urn(^d in 

 a current of ox3'gen. 



SILICATES AND OTHER MINERALS. 

 The only siliceous mineral observed was found coating a small 

 portion of some schreibersite, and thoug-h large amounts of iron were 

 treated for the purpose of securing- more, none was found. The 

 mmeral was clear, colorless, and entirely without effect on polarized 

 hg-ht, and not enough of it could be secured for analysis. No other 

 minerals, such as rhabdite, cohenite, chromite, diamond, etc. were 

 observed. ' 



