Mr. Farey’s Notes on Mr. Bakewell’s Geology. 329 
[P.281 Jeurs inVeins or Cavities in (probably the same, or Halkin ?) 
Limestone Rock, P. M. xxxviil. p. 274, and Rep.i. 402 
Note, and p. xlvii. 
1. 9, the subjacent Rock +.—+ Rep. i. 280. 
1. 12 and 13, rests upon slate {.—{ This is an assumption 
supported by no just analogy, see my Ist Letrer, vol. xlii. 
p- 99, and Notes on pp. 274 and 279. 
As 15, 250 yards**.—** 350 yards, and probably much 
more; the seven Rocks, four of Lime and three of Toadstone. 
i. 17, varying muchft+.—t+ Rep. i. 288 and 276. 
1. 20, much thicker t?.—f{f{ Rep. i. 280. 
282, 1. 8, our present manager*.—* Mr. Theodore Silverwood, 
whose ‘ Section” I have noticed, Rep. i. xxiv. but have 
therein, hardly done sufficient justice to his great kindness 
to me when on my Survey, or said all which I ought, of such 
a benefactor to the Science of Geology, in my 2d Letter, 
vol. xlii. p. 109; and in the following page, I have omitted 
to mention, that the Section-line I have suggested, would, 
on the west side of Golden Valley, pass along the line of 
the Butterley Tunnel on the Cromford Canal, whereby an 
excellent Section that already exists, of 2978 yards in length 
of this line, in the possession of William Jessop, Esq. of 
Butterley Hall, would be brought into use, and rendered. ex- 
tremely interesting. When I was’at Butterley, Mr. Jessop 
kindly lent me this Section to take with me to Mr. Mush- 
et’s, where it remained some time, and, if I mistake not, 
Mr. Silverwood made and retained a copy of it, which un- 
fortunately I had not leisure to do myself, but was content 
with noticing an abstract of its results, the greater part of 
which will appear in my account of this Canal, in the 3d 
volume of my Report now printing. 
283, 1. 13 and 14, to reach the coal strata*.—* Seven hun- 
dred yards is very far short of the probable distance, of 
even the Red Marl, (Rep. i, 116) below London, see my 
Note on page 259. 
1, 21, in Mr. Townsend’s estimate+.—t+ Which, of “the 
Derbyshire strata,” has Mr. Townsend included in his ac- 
count, quoted by Mr. B. p, 260 ?—Mr. T. says a great deal 
in his work, on very slender grounds, about the “* Mountain 
Limestone’”’ of Mendip and its neighbourhood, being the 
saine as in the Peak of Derbyshire, yet he expressly says, it 
is a different stratum from the “ Lyas,” which last he states 
uly at 20 yards thick, arid the Mendip Rock is not there- 
fore included in page 260. I think, that these Mendip strata 
are greatly thickened beds of the Lias} or perhaps of some of 
its 
