ON THE THEORIES OF ELEVATION AND EARTHQUAKES. G7 
garded as almost a necessary consequence of such elevation, and not as an 
arbi^ary and mdependent assumption; for the escape of the elastic vapours, 
and frequently of the mtuinescent fluid itself, through the fissures of the up- 
lilted mass, could scarcely fail to render the expansive force of the fluid too 
iceble to support the superincumbeDt weight, and to prevent subsidence as 
immediately consequent on great elevation. 
Stro^.—AmoBg the most curious of the pb®nomena attri- 
ftutoble to great honzoutal pressure, are folded strata. It may be worth 
whiJe to consider some of the modifications of form to which these folds 
tMv be eal^eo^ supposing them to result from the horizontal pressure in 
suco cases as those above discussed. 
In the first place, supposing always the compressing force to be horizon- 
toir ^eeivc the compressed iham to be horizontally stratified. Then, if 
the s^ta be so constituted as to form in regular folds, a vertical section of 
a Saturn along the direction of compression will evidently be such as repre- 
seniea m tg. 7 , where the dotted-lines denote the undbturbed position of a 
