HEAT PHENOMENA. 265 



stances, gas or water, could serve as a vehicle to transport this heat to the 

 upper portions of the Lode ; and while gas is absent, the immense volumes 

 of hot water form the most serious obstacles to mining. Water, then, has 

 been the vehicle of the heat. The same results, therefore, as were arrived at 

 in the first section of the chapter fi-om geological and chemical arguments, 

 are reached by discussion of the thermometric observations. 



