[ 3i3 ] 
nor, with proper Ingredients, procure a Vitrifica- 
tion or Fufion (a). 
Altho* Mines have not perhaps been difeovered 
near the Lough , I have Reafon to believe that there 
are fuch in its Neighbourhood, from the great Quan- 
tity of Iron-Stones found on its Shores, and Places 
adjacent to it, and from the yellowifh Ochre and 
Clay to be met with in many Places near it. Of 
thefe Iron-Stones, which are very ponderous, out- 
wardly of an ocherifh yellow Colour, and inwardly 
of a reddifh brown, I have calcined many, and do 
find the Powder of all to yield flrongly to the 
Magnet. 
Gerald Boate (^) mentions an Iron Mine, in the 
County of Tirone , not far from the Lough , and fuch 
others at the Foot of Slew-Gallen Mountains. 
That Mines are generated and found in the Bowels 
of Hills and Mountains, is obvious to any that have 
the leaft Knowlege of Metallurgy 5 and that Springs 
alfo proceed from Mountains, is no lefs obvious ; 
therefore fhould a Spring happen in the Bowels of 
any of thefe Mountains to run thro' a Vein of Mine- 
ral of any kind foever, it will wafh and dilute fome 
Parts of fuch Mineral, impregnate itfelf with the 
un&uous, faline, and metallic Particles of fuch Mines r 
and convey them along with its Water; and if in 
its Way, whether under ground, or at its iffuing 
out 
(a) Scones of the calcarious Kind turn to Lime by Calcination, 
and ferment with Acids ; but other Kinds, fuch as Slace, Fire-Stone, 
Free-Stone, Rag, Grill, <&c. will do neither, as Experience has hi- 
therto teftified. 
(b) Nat. Hijl. of Ireland, Dub . 1726 , 
R r . z 
