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out of the Crucible, and cooled, had the Colour of 
Iron, when heated in, and cooled from the Forge. 
Part of another Stone, which, by vifible Veins of 
Ore, appears to contain a good deal of Iron, I like- 
wife calcined for four Hours ; the Powder yielded 
mod furprifingly to the Magnet $ fo that it appears, 
that the Opinion of Nennius , Boetius, and other 
ancient Writers, was nor abfolutely defiitute of 
Foundation. 
The white Wood-Stones are generally found in 
the Ground at 2, 4, < 5 , and 8 Miles Diftance from 
the Lake, and fometimes very deep in the Earth. 
The black ones are always found in the Water, or 
on the Shores of the Lough; fometimes at the 
Mouths of Rivers or Rivulets that empty themfelves 
into it; but thofe with Wood continuous have not 
yet been found above 20 Yards Diftance from the 
Water of the Lake ; that is, where the Water reaches 
in the Winter, or at other times. 
Some of thefe Stones are outwardly covered with 
a thin white Subftance, which hath run thro' the 
Pores of that Part of the Stone that was expofed to 
the Air, and not covered by the Water, Mud, or 
Clay ; and on fome others it is rather anlncruftation 
of that white Subftance, which I take to be the flimy, 
un&uous, faline Parts of the petrefeent Juices that 
filled the outward Pores of the Stone, or coagulated 
on it. This white Part feraped, and put into a Cru- 
cible in a violent Fire, could not be reduced to 
Lime, tho' it grew red as Coal. This Powder cal- 
cined appeared thro* the Microfcope quadrangular, 
like Grains of Salt ; which makes me fufpedt, that 
thefe Petrifications contain, befides metalline, a great 
deal 
