186  - Mr. Farey’s Notes on Mr. Bakewell’s Geology. 
P.213, 1. 23, from the conjectures *,—* Are not the “ conjecs 
tures,’ in the work alluded to, always distinguished as 
such ?, and the precise localities, if not the full cireum- 
stances, of all the facts stated, and names of authorities 
given ?:—en which points, Mr. B. might have taken a use- 
ful lesson, for his work. 
214, 1. 11 and 12, filled up the fissure *—* Rep. i. 247. 
1, 18, crystalline forms are obtained +.—f Rep. i. 247. 
1, 24, narrower in their descent {.—{ Rep. i. 251. 
215, 1. 14, Ecton copper-mine *,—* Rep. i. 258 and 353. 
216, 1. 22, fluor spar mine*.—* Mawe’s Min. of Derb. p. 693 
Water-hull, Cliff-side, and Old-tor Mines, Rep. i. 269 and 
461. 
217, 1. 7, the natural caverns *,—* The remarkable property 
of thick Limestone Rocks, in every part of the world, I be- 
lieve, to produce Caverns, is not noticed in this work, or 
this geological phanemenon mentioned, except here and at 
p- 18, [ believe, and when they oceur as wide places in 
Veins, at pages 214 and 216 ; although it should seem, from 
your account of Mr. B’s Lectures in vol. xxxix. p. 236, that 
he there particularly noticed them, and attempted to account 
for their formation, in a manner, to which I opposed some 
facts (in page 427 of the same volume), to which he has not 
replied at p. 47 of vol. xl. but this common and important 
phenomenon, is almost excluded from his subsequent work. 
That the shrinking or contraction of the masses of Lime- 
stone, have occasioned the Caverns and large cracks, whicli 
so remarkably distinguish calcareous Rocks, can admit of 
no doubt, as observed in my Rep. i. 292; and the same 
principle will doubtless account, for nearly all known natural - 
Caverns, | believe, as well as for the opening of Mineral 
Veins, in general, which I have more effectually shown, I be- 
lieve, (Rep. i. 246, P. M. xxxix, p. 428, &c.) than any 
other English writer, and yet, at p. 223, Mr. B. persists in 
ascribing to M. Werner, only this mode, viz, of shrinking, 
for opening of Veins; notwithstanding his own express re- 
ference to Slips, (as observed Rep. i. 74 Note) and more 
particularly, to the splitting and falling asunder of Rocks 
ly their own weight, by M. Werner himself, at pages 49, 
50, 82, 88, 89, 95, &c. of the translation of his “* New 
theory of Veins,” see my Notes on pages 299 and 223. 
-218, 1. 3, and unites again*.—* It seems doubtful, whether 
Mr. B. here alludes to what are called Riders, those large 
stony masses, which are commonly found in Veins, and 
‘which were until lately, said to be fragments rent off from 
‘the adjacent Rocks; and many fine theories were accord- 
ingly 
