( 4°4 ) 
Thus in Figure the firfl, A D (hews a Load running 
in the Side of a Hill, B the Feeders , C the Flook * 
D is the Part heaved . 
Sometimes, tho’ not conftantly, the Mine is lined 
with an intermediate Subftance between the Load and 
it felf. This is (properly fpeaking) the Wail of the 
Load: Though, in the common Acceptation of that 
Term, it fignifies either fuch intermediate Subftance, 
or the Side of the Mine, where the Load immediately 
unites it felf to it. Thus in Figure the fecond , A is 
the Side of the Mine, B the intermediate Wall of 
white Mundick, C the Load of Copper. And in Fi- 
gure the third , A B the two Walls of Spar-Stone , 
C a fmall Vein of Fin Oar . 
The Springs in thefe Parts are always hard, as a - 
bounding very much, either in ftony, or fulphureo - 
f aline Particles. 
From this Water thus faturated with ftony Par- 
ticles, we frequently find the Paffagesof the*W ater un- 
der Ground, either partly, or totally flopp’d up \ the 
ftony Matter gradually concreting round the Sides of 
the Mine, and forming thereby a confufed Load of 
Spar-Stone. 
At other Times this ftony Matter concretes more 
diftin&ly : In which Cafe the ftony Matter feems to 
be govern’d in its Concretion by a Flaftick Power. 
N. B. When I fpeak of a Flaftick Power, I would be 
underftood as meaning only a Modus of Attra6lion , by 
which the attracted Particles are rang’d in this or that 
determin’d Form. This Power then fo exerts its Ac- 
tion, as to range the concreting Matter into the Form 
of an hexagonal Trifm , whole Head goes off in an 
* hexagonal 
