111 
come from the Levant. I have three or more varieties, in- 
cluding a substance much related to it, and Cullen’s Earth, 
as it is called in the shops, originally brought from Cologne 
in Germany. 
The second or middle figure in the plate is such as is 
sometimes found in the hollows of Quartzose rocks in mo- 
derate quantities. I have it from Devonshire, by favour of 
Colonel Montague. It seems to be an Oxide of Iron with 
the carbonaceous remains of veyetables. 
The next right hand figure was sent me from Scotlands 
I have some also from Warwickshire, by favour of Lady 
Markham, found among the Ruddle. The Iron in mest 
of them blackens when heated, and becomes magnetic, 
particularly in this last, and the vegetable remains are 
affected, something like Touchwood—see the left hand 
darker powdery figure. A more vegetable substance still 
is that resembling Colonian Earth, which I have along 
with petrified Wood and Jet. The form of the Wood re- 
mains represented in Stone, chiefly Quartzose, &c.; the 
Bitumen in the form of Jet, and the real Wood is as it were 
displaced in this earthy form. This more than commonly 
interesting specimen was sent from Kettleness near Whitby 
in Yorkshire, by favour of J. M. Sowerby, Esq. 
The lower figure represents Terra Sienne, a famous rich 
brown ; chiefly an oxidized Iron. It was sent by Natha- 
niel John Winch, Esq. and his friend Thomas Crawhall, Esq. 
from Cheviot Hills. It is certainly a new addition to the 
mineralogical catalogue of Great Britain. It is generally 
found in small pieces, is brittle, and often with a sharpish 
and smooth or glossy conchoidal fracture, having occa- 
sionally loose grains of yellowish Ochre about it. It may 
be used in a more transparent style than those before men- 
tioned, and will serve in the last spirited touch, to give a 
zest to the picture, and leaves it in the highest taste, espe- 
cially suited to Rembrandt’s style. Asphaltum, v. 2. p. 74, 
t 
