MORSE. — STUDIES ON FLUORITE. 609 



4. Sample from same specimen as 1 and 2, but taken at low red heat 

 and consisting only of the last portions of the gas which came off. 



Composition : 



Carbon dioxide 64.7 % 



Oxygen . . . . 

 Carbon monoxide 

 Hydrogen . . 



Nitrogen (remainder) 



0.7" 



12.8 " 



14.8 " 



8.0" 



101.0" 



5. Average analyses of six samples of Weardale fluorites. These 

 were not clear and contained many inclusions. The large amount of 

 carbon dioxide is probably due in part to adhering small particles of 

 calcite, although great care was taken in separating the visible calcite 

 as thoroughly as possible. 



(a) Temperature, 28° (air bath) 



Carbon dioxide 50 % 



Oxygen 2 " 



Carbon monoxide 6 " 



Hydrogen 14 " 



Nitrogen 28 " 



(b) At low red heat (combustion furnace) 



Carbon dioxide 50 % 



Oxygen 1 " 



Carbon monoxide 5 " 



Hydrogen 16 " 



Nitrogen 28 " 



6. (a) Clear deep green fluorite from Westmoreland, N. H. No 

 inclusions visible with the microscope. 250 gms. Gas evolved, 18.9 c.c. 

 Low red heat (combustion furnace). Time of heating, four hours. 



Composition : 



Carbon dioxide 10.0 % 



Oxygen 6.3 " 



Carbon monoxide 6.9 " 



Hydrogen 51.7 " 



Nitrogen (remainder) . . . . 24.6 " 



"99^5 " 



VOL. XLI. 39 



