Mr, Farey’s Notes on Mr. Bakewell’s Geology. 325 
Liverpool, to he appliéd to the linch-pin of a carriage, to prevent 
the wheel coming off its axle, if the linch-pin should drop out ; 
this contrivance being wholly applied at the extremity of the 
axletree, close to the linch-pin, it may be used in combination 
with Mr. Padbury’s invention, and would then render a carriage 
so secure that it would be scarcely possible for the wheel to come + 
off, by any accident short of the breaking of the axletree: and 
even then there would be a chance of the wheel being retained, 
in the-circular box EE, by the point of the screw e, so as to 
sustain the carriage from falling, until the horses could be stopped. - 
LXXI. Notes and Observations on Part of the Eleventh 
sand the Twelfth Chapters, and Appendix, of Mr. Ropert 
BakEwELv’s “ Introduction to Geology ;’’—embracing inci- 
dentally, several new Points of Geclogical Investigation and 
Theory. By Mr. Joun Farix, Sen., Mineral Surveyor. 
[Concluded from p. 261.] 
Notes, Sc. 
cP. 274] 1. 8, of Craven.in Yorkshire {|.—t The north-western 
parts of which, at least, seem to have the same Limestone 
Rock as in North Wales, aud in Shropshire, as Mr. B. is 
said to have represented, P. M. xxxix. p. 236, but not the 
same with the lowest of those in the Peak of Derbyshire, I 
think, see my Ist Letter, vol. xlii. p.59, and 3d Letter, p. 170. 
1, 12, exclude the coal **,—** The mode in which this 
exclusion happens, is very conveniently passed over in si- 
lence, see a Note in my 2d Letter, vol. xlii. p. 105. 
1. 18, a few miles onlv}+.—tf Query,—see my Ist Let- 
ter, vol. xlii. p. 57, and notes on p. 257: 
, P. 275, 1. 14, Some traces of the rocks*.—*The great improbahi- _ 
lity of this supposed identity of the Peak Limestones, with 
those of Ticknall aud Grace-Dieu, is heightened, by another 
supposition in p. 166, of Wild-Park, Breedon and Clouds- 
hill, contorted magnesian Limestones (intermixed with these) 
being identical with the yellow Lime Rock, on the eastern 
side of Derbyshire, as observed in my Note on p. 167, see 
-also my 2d Letter, vol. xlii. p. 106.—* It will scarcely sa- 
tisfy the curious to be told, that these lime rocks are mere 
anomalous masses,’’ Mr. B. p. 46, in your xIth volume. 
1. 26, west side of Anglesea +.—+} The Coal-field in An- 
glesea is situated on its south-east side, rather, (see vol. 
xlii. p. 57): here three seams of Coal of good caking quality 
have been wrought, at different times, in the parish of Llan- 
fihangel Esceifiog, for ages past; the uppermost of these is 
X3 a soft 
