258 
P.51. 
Mr. Farey’s Notes on Mr. Bakewell’s Geology. 
lava, powerfully expanding itself, could suffer, 
much less cause (as seems here insinuated) part of 
the surrounding masses, against which it acted 
(equally on all sides, by the known laws of 
fluidity), to sink, wr approach towards the ex- 
panding mass! Perhaps Mr. B. wall wish to 
amend his words, and say, “ after the surface had 
risen in one part, it sunk in another;” but which 
even will no better avail him, unless he can show, 
why that part of the shell which had stood firm 
and unmoved by the expanding action, should 
immediately after (much less at the same time), 
give way and sink down, in preference to that 
which had just been heaved up by its action.— 
But it seems a loss of time, to notice such crude 
whims. 
52,1. 3, defended from. attrition*.—* The common ap- 
pearance of extraneous fossils, and of known allu- 
vium, which have suffered little or no attrition, 
by a distant removal, as on the Chellaston Gyp- 
sum, see my 2d Letter, (p. 105), compels us to 
seek a more general and adequate cause, than a 
coating of ice.—TIn the great alluvial Clays of 
Bedfordshire, very large ragged flints, with loops 
almost like the handles of pitchers, and more 
easily broken off, are commonly found in digging 
(with other not less fragile ruims of the distant 
chalk Hills), and are often used for weights to their 
roasting Jacks. Wery large masses of laminated 
clay are also found lodged in the gravelly mixtures 
here. In Dorsetshire larger unbroken masses of 
the stratified Pipe Clay (of Purbeck, probably) 
are found lodged in gravel ; at Hagworthingham 
in Lincolnshire, I have seen large masses of thinly 
stratified Clay, with their edges little worn, lodged 
in confusion, on the top of a Hill, among immense 
bolders and rounded stones. A multiplicity of 
similar facts show, that a great deal of the known 
alluvium must have been borne up above the sur- 
face and moved in mass (generally, if not always; 
from SE to NW or near it, as Mr. Smith long 
ago discovered, P. M, xxxv. p. 135) instead of 
being rolled along the surface; and the same re- 
mark will evidently apply to many self stones or 
moved Blocks, see Ice Lorne, in Dr. Rees’s Cyclo- 
pedia, and Rep. i. 143, 
‘Py 60, 
