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3» Vijfertatione ep}llolare del fosforo mnerale e fia dcUa 
pietra illuminabile Bologneje^ a Sapienti td erudttt fig' 
mrt Collettort degli a^la eruditorum di Lifjia. fcritta 
da Lutgi Ferdinando Conte Marjigli, &c, Lipf, 1698, 
THis Diflertation which has 3 r Pages, was defigned 
to be prefented from the r\uthor to Mr. BoylCy but 
has been laid afide fince his Death till now. This Bono- 
man-Stone is found Three Miles from Bononia in the 
Mountain Faderno, or Eight Miles weftwardtrom thence, 
inthatHillcalIedFrtf^^j/^/»<?.There are found ^ith it Red- 
bole, Efflorelcences of Salt, round and fquare Marcafues, 
and Plaifter Gypfum or Geflb. 
He defcribes the Fibres ot the Stone which many times 
run to a common Center, which is fo me Earth.To make it 
Ihine, it is prepared by grating the Stone fmooth with a 
File,dipping it in Brandy ; after which it is rouled in fome 
fine Powder of the fame Stone.and calciri'd in an openFur- 
nace^being plac'd in the middle ofliveCharcoal.When the 
Stone is calcin d the Cruft is taken off, and the Surface of 
the Stone, which is become Yellowifli, when expos d to 
the Light Air, imbibes the Light, and Shines like a Coal 
in the Dark. It will not be calcin'd into Lime. The 
Stone ftiines in Water, and receives the Light in Oyl of 
Nuts, but will not emit it till it be out of it. 
At the End of this Treatife is an Account of Plaifler or 
Gefib, of thefeveral Kinds of it, and where they are dug. 
He tells us. That the Workers in it, in (bme Days time, 
are cured of the Itch, either by means of its adftringenc 
Qustlity or Sulphur. 
The whole Treatife is illuftrated with variety of 
Figures. 
XV. A 
