an artificial Spring of Water . g 
and the ftrata, which compofe the central parts of it, and 
which are found nearly horizontal in the plain, are raifed 
almoft perpendicularly, and placed upon their edges, while 
thole on each lide decline like the furface of the hill ; fo that, 
this mountain may well be reprefented by a bur made by forc- 
ing a bodkin through feveral parallel fleets of paper. At Rou- 
ter, or Eagle- Rone, in the Peak, feveral large maffes of grit- 
stone are feen on the fides and bottom of the mountain, which 
by their form evince from what parts of the fummit they were 
broken off at the time it was elevated ; and the numerous loofe 
Rones Scattered about the plains in its vicinity, and half buried: 
in the earth, mud have been thrown out by explofions, and 
prove the volcanic origin of the mountain. Add to this the 
vaft beds of toad-ftone or lava in many parts of this county, 
fo accurately defcribed, and fo well explained, by Mr. White- 
hurst, in his Theory of the Formation of the Earth. 
Now as all great elevations of ground have been thus raifed 
by Subterraneous fires, and in a long courie of time their Sum- 
mits have been worn away, it happens, that Some of the more 
interior ft rat a of the earth are expofed naked on the tops of 
mountains ; and that, in general, thofe ftrata, which lie up- 
permoft, or neareft to the Summit of the mountain, are the 
lowed: in the contiguous plains. This will be readily con- 
ceived if the bur, made by thrufting a. bodkin through feveral 
parallel fheets of paper, had a part of its apex cut off by a pen- 
knife, and is fo well explained by Mr. Michele, in an inge- 
nious paper on the Phenomena of Earthquakes, published. -a few 
years ago in the Philofophical Transactions. 
And as the more elevated parts of a country are fo much 
colder than the v allies,, owing, perhaps, to a concurrence of- 
two ■ 
