( 4*9 ) 
V. An Account of the federal Strata of Earths a)id 
Fojfils found in jinking the mineral Wells at Holt, 
©jy the (Reverend Mr. Lewis, Vicar of the Tlace. 
Communicated hy John Brome, Effc 
A Fter they had palled the upper Turf, they came 
to a blue Clay, which held about 3 Foot} then 
they met with a yellow, brittle Clay, very much like 
Ochre, ufed by Painters, about z Foot in Thicknefs^ 
and next with a Loam of a loofer Texture, which 
fparkled with a kind of Talc, called by the Naturalifts 
Selenites, and was intermixed with yellow Ochre. 
Thefe Selenites, which were plentifully found Ihot in 
the Clay, were Chryflals conlifting of tranfparent, 
fhining, brittle Flakes, fome of a Rhomboidal, others 
of a Conical Figure, but ail Hexacdra, or Columns of 
6 Sides. They had no fenlible Tafte of Salt, and the 
Clay in which they were found was interfperfed with 
Veins of coloured Earth, of the Colour of Sulphur 
and Iron Ruft. 
Below this, at about 10 Foot deep, they came to a 
Bed of Stones, of a large Size and very hard Tex- 
ture, coated with Flakes of Gypfum of a white and 
yellowifli Colour, which run through and divide them, 
as it were by various Membranes into different Cells, 
all filled with hardened Loam of a grey Colour. Thefe 
Stones, which were all of an oval Figure, in Shape re- 
fembling Pebbles, weighed from 10 to 60 Pound 
Weight, and lay all on a Level one by another in the 
U u u Bed 
