© 262 Maclure on the Arrangement and Origin of Rocks. 
duce the same effect, over the whole earth; but that the 
stratification of the different materials, follows any regular 
series of alternation, or that the strata are placed in the 
same order, one over the other, for any great extent of sur- 
rs to me not fully established; I doubt w: 
cons 
class of rocks, undivided by any high ridge or chain of 
mountains, offers a situation on a great scale most likely to 
A ae, FE 
e volcanic rocks, from their interfering with the two 
great sweeping theories of the earth’s formation, have had 
the smallest share of impartial examination. Having ov 
i. 1 oe’ rc = ee ee rot 
pendulum by the impulsion of Werner has been long kept 
in the extreme e i i 5 
found under the transition in some parts of this country i 
that is to say, rocks that from rational analogy, 00 the ex- 
amination of their structure and component parts, would 
