flcjCO: 



William E. Ford, 



/inCOK 



Fig 



therefore seem, as if, next to FeCO. the CaCO., group could 

 enter the rhodochrosite molecule with the greatest and the 

 MgCO;. molecule with the least freedom. This is a conclusion 

 contrary to what would have been expected from a consideration 

 of the molecular volumes of the different groups. The fact, 

 however, that AlgCO, occurs comparatively seldom in the anal- 

 yses may indicate that the conditions for formation of rhodo- 

 chrosite are unfavorable to its presence. It might be that the 



