( JO ) 
Selago folns Sf facte jihkth Fk Jen, On the 
' Mountains near Darwent. 
Bryum Hypnotdes capituUs^ plurmis ereBis la^ 
mginofum Dillemi. On the Mountains. 
Cardamtne impatiens altera hirfutior Rail Syn, 
About the Mouth of PooVs-hole plentifully. 
A Variety of Mr. Ray's V'tola montana htea with 
a blue and yellow Flower. 
The Lead-mines m. Derhypire are very various with 
regard to their Courfes. One into which I went 
down, had two Branches , one running to the N. E. 
the other to the N. W. And as I was informed, one of 
the belt they ever difcovered ran due North. Their 
Breadth and Depth are full as irregular. The Bodies 
through which they dig to come at the Vein are gene* 
rally Lime/lone and Black Shale. But it is uncertain 
which of the two is uppermoff. Of twoMines into which 
I went down, in one they had dug firft through 26 Yards 
of Limejone^ then through one of Black Shale: In the 
other firfl: through 42 Yards of Shale^20\di then through 
28 of Limejone. The Subftances which - they find 
mixt with the Ore^ are 
I. Chert. This is a kind of Flinty which Dr. 
JVooduoard * fays is called fo, when it is found in thin 
Strata. But in the Peak the Strata of Chet't are 
often four Yards thick, or thicker. They are found in 
Limejioney and not always difpofed in Strata. Thofe 
which I took Notice of were generally either black, or 
of fuch a Colour as the infpilTated Juice of the Buck- 
thorn Berries, which the Painters call by the Name of 
Sap-green : Whence they are called Green Cherts 
and Black Cherts. 
* Method of FofCls, p. ir, 
2. Spar. 
