460 



DAY AND shepherd: WATER AND MAGMATIC GASES 



TABLE II 



Analyses of the Fixed Gases (Proportions by Volume) 



* Inasmuch as all the tubes contained water, practically all of the SO- had gone 

 into solution in the water and become altered before the final analysis was made. 



TABLE III 



Analyses of the Water (Proportions by Weight) 



0.080 



grams 



Na20 0.0214 



K2O 0.0102 



CaO 0.0120 



FejOs \ 



AI2O3 / 



CI 0.220 



F 0.565 



NH3 0.0018 



TiOo 0.005(?) 



Total S as SO3 0.480 



2 



grams 



o.osr 

 0.011 



0.14 \ 



0.010 



0.208 



0.492 



none 



none 



0.508 



The major portion of 

 these may have come 

 from the glass or from 

 Pele's hair. 



The conclusions from these analyses may be briefly recounted 

 as follows: 



(1) To anyone familiar with gas equilibria, it is immedi- 

 ately obvious that this group of gases can not exist together in 

 equilibrium at a temperature of 1000° or more, but must be in 

 process of active reaction at the time of release from the liquid 

 lava. Reaction will begin between the gases in the rising lava 

 column the moment pressure has diminishd to the point where 

 they begin to be released from solution. As the lava rises to the 

 surface, the pressure upon it diminishes steadily, setting free a 

 continually increasing quantity of gas which is then free to enter 

 into new chemical relations. iVIoreover, these reactions (e.g., 

 H2 + SO2 and H2 + CO2) are of a kind to produce heat in such 



