914 PROCEEDINGS OF THE ACADEMY OF [DeC, 



niim group are certainly absent from this material. Now, although it 

 is conceivable that a stony meteorite containing metallic iron might 

 \mder some circumstances, such as prolonged heating in a reducing 

 atmosphere, acquire a superficial coating of iron, yet it is entirely 

 inconceivable that such a coating, concentrated upon the surface from 

 a stony interior, could contain a definite and constant proportion of 

 metals of the platinum group and yet leave the iron still contained in 

 the mass entirely without any such constituents. Mr. Barringer's 

 account of these unusual formations at Coon Butte immediately pre- 

 cedes this paper. 



