THE ANALYSES. 



19 



TABLE 8 Continued. 



1 Carbonated. 



2 The identical sand used in No. 75, powdered, and heated a second time. This experiment was to determine 

 whether gas which was unable to escape might not still remain within the sand grains. As this powder yielded 

 more gas than the fresh sand, most of the gas in the first trial apparently came from the surface or near the surface 



f t 3 1 No. r 84 DS Analysis: SiO-, 43.98; ALO 3 , 13.30 ; FeoO 3 , 3.67 ; FeO, 6.92 ; MgO, 7.03; CaO, 10.66; Na-,0,2.15; K0, 1.64; 

 H 2 O, 1.94 ; TiO 2 , 1.18; CO,"6.46; P 2 O 6 , .32; FeS 2 , .54 ; etc. .36; 100.15. 



