{[ 356 J 
LIX. Notes and Olservations on the fourth, fifth and paré 
of the sixth Chapters of Mr. Ropert BAKEWELL’s © Jie 
troduction to Geology ;”—embracing incidentally, several 
new Points of Gealogical Investigation and Theory. By 
Mr. Joun Farry Sen., Mineral Surveyor. 
To Mr. Tilloch. 
Sir,—L transmitting to you, the second division, which 
in order to suit the convenience of your work, has been 
made, of my Notes and observations on Mr. Bakewell’s re- 
cent Geological work; I beg the liberty of mentioning, 
that since the first division was sent, I have had an oppor- 
tunity (for the first time) of travelling across, and seeing 
the Polesworth Coal-field (p. 260, herein), and that part of 
North Wales between Holywell and Bangor, and of making 
a sufficient stay in Anglesea, to have become pretty well 
acquamted with its Limestone Rocks, particularly those 
which form a Trough, on the coarse Slate, across the Island 
from Red-wharf Bay on the NE to near Malldraeth Bay on 
the SW, and with the Coal-measures in this Trough, from 
near Ceint, southward to near Bodowen, but particularly 
with that part of them, near Berw, in which Holland Grif- 
fith, Esq. has an interest, part of whose Coals have for a 
considerable time past been advertised for letting, in con 
junction with those of a neighbouring proprietor. 
I mention these circumstances here, im order to account 
for several interlineations and additions to’ my Notes, written’ 
in July last, which I have lately made or intend to make, par- 
ticularly as to whin-dykes, pages 106 and 108 (of Mr. B’s 
Geology), Coal-fields pages 108, 275 and 285, Conglomerate 
and coarse Gritstone strata, with Jasper fragments and Rocks, 
&c. p. 202, Lzmestone Strata, p. 295, Granite and Serpen- 
tine, p. 296, and perhaps others. Hoping that my example’ 
may stimulate others of your Readers, to communicate’ 
through your work, ¢he observations they may have oppor- 
tunities of making on the British Strata, 
TI remain, sir, 
Your cbedient servant, 
Upper Crown-street, Westminster, Joun Fare¥ Sen, 
15th Nov. 1813. 
Notes, &é. 
P, 85, I. 8, water-worn pieces*.—* Query ?, see my Note on 
page 44. ‘ : 
87,1. 3 and 4, sixty degrees*.~* See ninety degrees or 
* “near 
r 
