89 
TAB. CCXLV. 
QUARTZUM  argillaceum. 
Common Clay. 
Class 2. Earths. Order 2. Mixed. 
Gen. 2. Pulverulent Quartz. Spec. 1. Mixed with Argilla, 
Syn. Potters Clay. Kzrw. 1. 180. 
Clay. Bab. 50. 
Argile glaise. Hatiy, 4. 442. 
Loam, Potters Clay, Pipe Clay, and Variegated 
Clay. Jameson, 1. 301. 
PIPE CLAY. 
Tue best Pipe Clay (upper figure) is from Teignmouth 
in Devonshire, and is used in large quantities (being 
washed, and made plastic with water) for forming tobacco- 
pipes, and mixing in various sorts of pottery, at Vauxhall, 
&c. Much the same substance is found at Cambridge, 
called Gault, and is used for similar purposes, and of the 
more sandy sort are made whitish tiles and bricks. These 
nearly resemble the Flanders and Bath bricks *, as they are 
called ; now I suppose a great and profitable article of trade, 
as they sell at a good price, 4d. each, for cleaning knives, &c. 
Pool, in Dorsetshire—see middle figure—has much of 
this Clay, but rather inferior in quality in general. 
Alum Bay in the Isle of Wight and Holyhead in Wales 
—see lower figure—afford Clays of this kind, besides many 
other parts of Great Britain. 
* Which only differ in containing a much greater quantity of Sand. 
