Geology and Natural History. 225 
possible injection, or with tangential pressures, enough still, in 
some cases, to produce partial permanent elevation 
hen subterraneous crushing takes place, and the cireumstances 
of the site do not permit the access of water, there may be earth- 
quake, but can be no voleano; where water is admitted, there 
h 
~~ e both. 
nd thus we discern why there are comparatively few sub- 
” as an engineer would say, by the huge 
deposit of incoherent mud, etc., that covers most of it, and prob- 
etted hydrogen produces a brilliant light in combus- 
tion, it is largely manufactured for the illumination of cities and 
bs So extensively is it employed for this purpose 
it ma 
Civilization It is not strange, then, that efforts have been made 
to utilize the immense quantities of gas which flow from wells and 
Springs in so many different countries. ie Chinese aed 
hundreds of years used for lighting and heating the gas which 
the United States the gas which issues from the t tb 
Kanawha Valley has ‘ee for many years employed as a fuel in 
the evaporation of the brine. 
e ,in Wes rae 
forty years been fully or partially lighted by gas which issues 
