296 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1913. 



while the water (about 20 cubic centimeters) yielded: 



Gram. 



CI 0.0513 



F .0079 



SO, .328 



NHa .0 



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 : 



[Per cent by weight.] 



OO2 8. 12 



O2 L 14.58 



N2 51. 20 



H2O 25.49 



SO3 . 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 following: 



Gram. 



CI 0.0298 



F . 



SO. . 656 



Fifty meters to the northeast of this point, along the same crack, 

 the gas obtained was merely moist air, with a trace of SO2 and 

 uncertain traces of CI. 



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 : 



[ Per cent by weight. ] 



CO2 9. 64 



O2 18.18 



N2 63. 85 



HiO 7.81 



SO3 . 51 



CI • 



The water condensed in a tube filled by pumping at this point 

 yielded about 3 milligrams of chlorine, but no fiourine. 



With regard to the chemical products along this circular crack 

 about the crater basin of Halemaumau. we can sum up by saying that 

 water, although no doubt partly of meteoric origin, was always pres- 

 ent at the time of our visit, and the gases were prevailingly high in 



