NATURAL HISTORY. 
Down, no doubt the same kind of whet-stones as 
that furnishes, might be obtained ; and the natura- 
list would at the same time be better enabled to ex- 
amine the numerous species of fossils in which it 
abounds. 
THe Bovey Cray Formation, The availa- 
ble portion of this, as we have previously stated, 
consists of five distinct beds running parallel be- 
tween as many others of gravel; the two western- 
most beds are what are technicaily called, cracking 
clay—the two next or middle beds, black clay. 
(These four are the beds used m the manufactory of 
porcelain and earthen-ware)—and the most eastern 
bed (which is much wider than either of the others) 
Pipe clay, which is so strongly impregnated by iron 
that it is unfit for the potter’s use, and is confined 
to the manufactory of pipes. The pure body adapt- 
ed for the market, commences on the left bank of the 
Teign, nearly opposite Newton—the cracking and 
black clay beds, extending towards the north-west 
to the base of the granite hills between Hightor and 
Bovey Tracey—the pipe clay is limited by the op- 
posite hills, as previously stated. Ciay has been 
worked ou the opposite side of the Teign, but it has 
proved of an inferior quality, unfit for the market. 
It is worked in square open pits to various depths 
of from 30 to 80 feet; under the whole of 
the four western beds, Bovey coal occurs, and 
abundance of water—under the eastern one, sand ; 
it is cut out in small cubic junks, technically called 
elay balls, of which, many thousand tons are an« 
