( 4io ) 
tal Fiffure and another. Of thefe Layers of Fullers- 
Earthy the upper Half, where the Earth breaks itfelf, 
is ting’d red, as it feems by the running of Water from 
the fandy Strata above , and this Part they call the 
Crop 5 betwixt which and the Cledge above-mention’d, 
is a thin Layer of Matter not an Inch in Depth, in 
Tafte, Colour, and Conliflency, not unlike to Terra 
Japontca, The lower half of the Layers of Fullers- 
Earthy they call the Wall-Earth j this is unting’d with 
that red above-mention’d, and feems to be the more pure 
and fitter for Fulling *, and underneath all is a Stra- 
tum of white rough Stone, of about two Foot thick, 
which, if they dig through, as they very feldom do, 
they find Sand again, and then is an End of their 
Works. 
One Thing is obfervable in the Site of this Earth, 
which is, that it feems to have every where a pretty 
equal horizontal Level , becaufe they fay, that when 
the Sand-Ridges at the Surface are higher, the Fullers- 
Earth lies proportionably deeper. 
In thefe Works they feldom undermine the'tltound, 
but as they dig away the Earth below, others are em- 
,ploy’d to dig and carry off the Surface^ otherwife, the 
Matter above, being of light and flitting a Nature, 
would fall in and endanger the Workmen : For, as 
was obferv’d before, that Stratum of Sand-Stone, which 
occurs before they come to the Fullers- Earthy does not 
lie, as in Coal-Pits, immediately over the Matter they 
dig for, like a Cieling, but even in the midfl: of the 
fuperjacent Strata of Sand, and therefore can be no 
Security to them if they undermine. • 
The perpendicular Fiflures are frequent, and the 
Eardi in the Strata^ befldes its- apparent Diflindion 
into Layers, like all other Kinds of Matter, by.reafon 
2 of 
