(2%. 3 
WITT. Notes and Observations on the remaining part 
- 
of the Sixth and part of the Seventh Chapters of Mr. 
Rogpert BaKEwELw’s ‘* Introduction to Geology ;”— 
embracing incidentally, several new Points of Geological 
Investigation and Theory. By Mr. Joun Farey Sen.; 
Mineral Surveyor. 
{Continued from vol. xlii. p. $67.] 
Notes, &e. 
i. 143, |. 5, Loose stonest.—t Rubble, or angular broken 
stones, are never found im the Coa]-measures, though 
such often are on, near the surface, 11 Coal-fields, in 
common with almost every other paft of the stony 
strata. ’ 
144, |. 1, narruwer or wider *,—* Thicker or thinner. 
1. 10, the roof +.—f Rep. i. 345. 
1. 25, called tow t.—t Tawe, Duns, &c. Rep. 1, 348. 
147, 1. 6, raised on that side*,— * But the Coal and 
other strata may, on the contrary, be sunk on that side, 
if the let-down is greater than the depth of the pit gg: 
a case which not unfrequently happens, and such is 
evidently the source, of some of those grand mistakes, 
as to the identity of Coal-seams, with which I have 
ventured to accuse even the most experienced Coal- 
masters and agents, Rep. i. 166 and 167, &c. See my 
2d Letter, p. 110. 
], 22, shattered where they come in contact ¢.—t See 
my Note on p. 208. 
148, 1. 3, generally serve to identify it *.—* This defec~ 
tive rule, is often very improperly relied on, in speak- 
ing of the identity of Coal-seams (as observed in my 
od Letter, p. 111), when far better evidence on this 
important point, might easily be had, by comparing the 
entiré sinkings of the Pits, and tracing the bassets of 
the several strata on the surface, between the places. 
|. 9, 300 yards +.—t Clandewn Coal Pits, SE of 
Paulton in Somersetshire, are reported to me, to be 
400 yards deep! 
1.12, 30 feett.—t Rep. i. 176. 
]. 21, 13 feet thick **.—** Rep. 1. 196. 
149, 1.9, Bind or Clunch*.—* White stone, Rep. 1. 
176, and Mont. Mag. v. xxi. 
152, 1. 25, one-third of England *.—* Which the Lias 
strata and those above it occupy, Rep. 1. 116. 
153, |. 18, founderies *.—* Furnaces, Rep. i, 395. 
P.154, 
