OF CORNWALL. 65 
red, for all the purpofes of red Ochre, cannot well be expected to 
come from the ground. It may feem fomewhat ftrange that glebes 
of Earth, of fo red a colour, fhould be found Icattered in a body 
of clay fo white and pure ; but nature, as well under ground as 
above, is ftill various ; and the more we profecute our refearches, 
the more fubjects we may expect to meet with which will excite 
our admiration, and convince us of our ignorance. One thing 
however may be obferved, that thefe red and white clays are very 
different in nature as well as colour ; one, viz. the red, mixing well 
with oil, and not with water ; the other, as greedily imbibing 
water, and not enduring oil. If thefe fo different fubftances there- 
fore are now found in their original beds, as is moft likely, the red 
muff have been repelled on all fides by the white, and compa&ed 
together by the attraction of its own fimilar parts. 
In the parilh cf St. Kevran there is a yellow clay, which, for sect. x. 
catting filver, brafs, or lead, is reckoned to exceed every thing of Q a ^ evran 
its kind in thefe parts. 
In the parilh of Lannant there is a yellow clay much coveted for sect.xl 
building furnaces : ’tis carried off to Briftol and Wales, and other Lannant 
places, in fuch quantities every year, that Humphry Mackworth Cla> ' 
Praed, Eiq; owner of the Soil, makes above 100 pounds per 
annum of this clay, communibrn annis ; and from January 1757, 
to Midfummer following, received for it 150 pounds. Bricks 
made of this clay melt and vitrify in the Ere, running into one 
foiid body ; but afterwards never ftir till quite calcined, enduring 
the mod; intenfe fire beyond any bricks ufed for like purpofes. 
There is a yellow fandy clay in the Vorlas, near the Long Bridge, sect.xii. 
in the parilh of Ludgvan, good for bricks and plaifter ; and in fome Ludgvan 
parts of the fame pit, a fine blue clay, which, being well mixed with Cla> ’ 
white, (fuch as the Amalebreh before- mentioned) makes an excel- 
lent lute for affaying. This blue clay vitrifies prefently, but the 
white will fcarce vitrify at all ; neither of thefe clays is therefore 
proper for luting the crucible feparately taken, but mixed they corredl 
one another, and there is no better compofition for the allay furnace. 
Near the borough of Lilkerd there is found in great plenty a sect. xiij. 
yellow flatty clay of a fine earth; it feels and cuts fmooth, and with a Lifkerd Clay, 
good polifh, and the colour was as fine to the eye as the Naples 
yellow v ; but, upon tryal, it would not mix with oil ; it grew fat 
and greafy ; it is therefore a ffeatites. It is good for grafs ; for a 
S gentleman 
* A light beautiful yellow earth, much efteemed in painting. 
