596 DAY AND SHEPHERD WATER AND VOLCANIC ACTIVITY 



Other tubes which were filled by pumping at this crack were found to 

 contain fixed gases as follows : 



C0 2 5.8 (per cent by volume) 



2 18.2 " " " 



N 2 76.0 " " " 



while the water (about 20 cubic centimeters) yielded: 



Ci 0.0513 gram 



F 0.0079 



So] 0.328 



NH 3 none 



Another spot of great gaseous activity occurs in this circular crack near 

 the terminus of the automobile road and southeast of the center of the 

 active pit. The vacuum tube taken at this point yielded : 



C0 2 8 . 12 (per cent by weight) 



2 14.58 " " " 



N 2 51.20 . " " " 



H 2 25.49 " " " 



S0 3 0.59 " " " 



CI undet. " " " 



The water contained in the tube which was filled by 15 minutes pumping 

 at this point (amounting to about 15 cubic centimeters) yielded the fol- 

 lowing : 



Cl 0.0298 gram 



F none " 



S0 3 0.656 



50 meters to the northeast of this point, along the same crack, the gas 

 obtained was merely moist air, with a trace of S0 2 and uncertain traces 

 of Cl. 



About 100 meters south of the terminus of the automobile road is a 

 moist region, where the decomposed lava rock was found to be more or 

 less saturated with sulphuric acid, the decomposition products being 

 black rather than the bright sulphur yellow prevailing at the points above 

 described. A vacuum tube taken in this region, which is again on the 

 circular crack surrounding the pit and nearly due south of it, yielded : 



C0 2 9 . 64 (per cent by weight) 



2 18.18 " 



N 2 63.85 " 



H 2 7.81 " 



SO, 0.51 " 



Cl none M 



