366 Mr. Moyle's Analysis of the Atmosphere 



Nitrogen 85*36 per cent. 



Oxygen 14*51 ... 



Carbonic acid . . 0*13 



100*00 

 Sample 14. One quart. 

 Tresavean. — Coppermine, in granite. 1 56-fathom level ; 

 208 fathoms from surface ; two men in a core ; directly after 

 firing a hole ; sixty- five fathoms from winse or shaft ; specific 

 gravity *993. 



Oxygen. 

 Average of three experiments with hydrogen . . . 16*20 

 Average of two experiments with nitrous gas . . 16*50 



Mean . . . 16*35 



Garb. acid. 

 Average of two experiments with lime water .... 0*13 

 Average of two experiments with potash solution . . 0*13 



Mean . . . 0*13 

 A slight trace of sulphuretted hydrogen. 

 Composition of sample : — 



Nitrogen ...... 83*52 per cent. 



Oxygen 16*35 



Carbonic acid ... 0*13 



100*00 

 Sample 15. One gallon. 

 Wheal Ann. — Tin mine, in granite. A rise in the 80- fathom 

 level ; sixteen fathoms from any shaft or winse ; two men in 

 a core ; no gunpowder used ; specific gravity of air *995. 



Oxygen. 

 Average of six experiments with hydrogen and qua-~l ~ # ^ 



drisulphuret of lime J 



Carb. acid. 

 Average of four experiments with lime water and"! 



solution of potash J 



Composition of sample : — 



Nitrogen 83*20 per cent. 



Oxygen 16*72 



Carbonic acid . . . 0*08 ... 



100*00 



Sample 16. One gallon. 

 Wheal Ann.— As before. 100-fathom level; forty-five fa- 



