DAY AND shepherd: WATER AND MAGMATIC GASES 459 



We accordingly chose a favorable opportunity, descended into 

 the crater and inserted a tube directly into one of these cracks 

 behind the flame which was burning there. This tube was con- 

 nected with a pipe-line some 7 or 8 meters in length, leading to a 

 train of 20 collecting tubes, each of one-half liter capacity, and 

 finally to a piston pump with a capacity of abour 2^ liters per 

 stroke. The splashing of the lava within the dome could not 

 only be heard and seen thruout the 15 minutes during which 

 the pumping was continued but the jar could be felt beneath the 

 observer's feet. The temperature at which the gases entered 

 the tubes was about 1000°. 



With the first stroke of the pump water began condensing in 

 the glass tubes in considerable quantity, in plain view of the ob- 

 servers. This water, tho unexpected (in view of the statement of 

 Brun) also served as a most excellent wash bottle by means of 

 which to trap the halogens or other soluble salts asserted by 

 Brun to be present. At the close of the pumping the tubes were 

 sealed and taken out of the crater without mishap. Four days 

 later the contents of Tube No. 3 were removed for preliminary 

 analysis at the College of Hawaii in Honolulu. With the limited 

 facilities there available, no very elaborate analysis was possible, 

 but the following gases were found : 



TABLE I 



Weight 

 Per cent 



SO2 51 .6 



CO, 39 . 8 



CO 5.5 



It was not possible to analyze for H2 or N2, but a 1 : 1 mixture 

 of the gas residue with air gave no explosion on test. The tube 

 also contained about 50 cc. of water with sufficient free sulfur 

 to make it appear quite turbid. This water, when filtered and 

 treated with acid silver nitrate, showed no trace of chlorine. No 

 titanium was found. 



The remaining tubes were transported to the Geophysical Lab- 

 oratory in Washington at the close of the field season (nearly 

 a year later) and analyzed there. The analysis of the fixed 

 gases contained in five of the tubes is tabulated below. 



