OF CORNWALL. 97 
ground and charge , from the Portland, Oxford, and Bath-done ; 
lor all thefe are called free, not only lor their eafe in cutting, but 
for giving way to acids ; whereas our Polrudon done will cut in- 
deed, but not near fo freely as the forcmentioned, and will not at 
all ferment with aqua forth : our Cornifh done is cemented by a 
cry dal or quartz bads, and therefore is radically didind from thofe 
dones of Portland, Oxford, and Bath, which are concreted by a fpar. 
Ol Polrudon done is built the houfe of Anthony in this county, 
Plate IX. page 92. 
Of a dner clofer grit dill is the free-done raifed on Illogan 
downs, of which the eadern front of Tehidy houfe, Plate X. p. 94, 
is modly built. The ornaments of the portal and windows and cor- 
nice are of Portland, but the main body of the Comidi done, which 
is fo near the texture and colour of the Portland, that it requires a 
very near infpedion to diftinguifh one from the other. It unfortu- 
nately rifes in fuch fmall maffes, that it will feldom fquare to one 
foot and a half in block ; and in this quarry there is fo little found 
of it, that there was fcarce enough to dnifh the front below the cornice'. 
From the arenaceous let us proceed to dones of a larger grit. sect. vii. 
In Cornwall the moor-done appears in greater plenty than any Moorftone, 
other : It is fcattered over our hills from the Land’s End through the or gran,te ‘ 
Hundreds of Penwith and Kerrier. In Pydre Hundred there is 
fome ; but the dat and killas begin there to prevail and reach from 
Paddow, along the North fea, to the extremity of the county. In 
all the higher parts of the fouthern hundreds the moordone keeps its 
ground ; and in general we may fay, that the highed tors in the 
county are ufually fpread with what we call moordone, from its 
being found mod commonly in uncultivated moory hills and vallies, 
for in both dtuations there is great plenty of it, but oftener 
indeed to be feen on hills, the fame rain and doods laying dones 
bare on the tops and ddes of mountains, which cover them as often 
in the vallies. It is a great midake in Naturalids, to imagine, that 
moordone does not lie in ftrata \ The done-cutters indeed do not 
open any quarries for moordone ', becaufe that would be a needlefs 
labour, not becaufe they cannot find moordone under the ground ; 
every cliff, crag, and precipice, and a great number of mines, may 
convince us, that this done lies in doors and layers, Jlratum upon 
ftratwn , interfered by horizontal and perpendicular fiflures; for 
1 There is a very white done of this kind, of 1 So many large detached rocks of this kind of 
a fine, fmall, and uniform grit, which I have ob- ftone appearing above ground, and the mafons 
ferved about the midway between the borough of feldom working on any in the bowels of the earth, 
Camelford and the church of St. Teath, which may have occafioned hafty memorandums, made 
may very well reward a further fearch. en pajjant , which thence crept into collections and 
* Hill’s Follils, page 499. Woodward, &c. -catalogues, and thence from one book to another. 
C c evidence 
