60 
piece from Aspley, as above: it is the lightest and softest 
in my possession, and has a character peculiar to the best 
for use, viz. a semi-transparency at the edges, even when 
dry, as I figure it. The lower specimen came from Nutfield 
in Surry, which is less transparent at the edges when dry, 
and is darker coloured, especially when in the pit, where it 
is called b/ve, in a manner synonymous with Blue Clay*. 
I have a Sandstone from the bottom of the Bedfordshire 
pit, which has dark-green particles of Chlorite, such as is 
found in Cambridgeshire, and in the Irish Mulatto-Stone. 
I am told that under a surface of about six feet there are 
several strata of whitish and reddish sand, under which is a 
stratum of Sandstone, then a sandy Fuller’s Earth, called 
Cledge, which is thrown away ; and that the proper Fuller’s 
Earth is found at a depth of about 14 feet, when there is 
some redder Fuller’s Earth, called Crop; the lower half of 
the stratum is called JVall-Earth, and is reddish: but I 
suspect this must vary according to time and circumstances. 
The Surry Fuller’s Earth is found at different depths, as 
from nine to twenty or thirty feet. At one place, upon a 
hill, the surface was a wood; and when I examined the 
Earth at the bottom of the plants, I found it full of semi- 
transparent waxy particles with common light earth, and 
some ferrugineous appearances: below this were different 
strata of small stones, lying tile-wise, being flattish, and 
some approaching Hornstone, with a ferruginous sand, 
and green Chlorite particles: these are alternate, two or 
* Dark blackish Clay. such as Tile-Clay, is commonly called Blue Clay. 
