C S3i ] 
ter Nine; The Scheme fliews the reft of the Pha- 
fes. 
Of the Origin of white Vitriol and the Figure of 
its Cryflals^ not yet accounted for^ by Dr. Mar- 
tin Lifter^ F. R. S. 
A Mong&, the Dejiderata^ relating to Foffil sdti^ 
2x Origin that I know of white ritrtol is ob- 
fcure, and its Cryftals undefcribed. 
All I can find of this matter is out of Borrichius 
de Doclmaftice metallica , that it is produced from 
a certain Lead Ore, boiled raw. {Flumbi nigri ven^ 
vitriolum album producity etiam mn ere mat a) none 
that I know of, of ourEnglifli Lead Ores giv^es us any 
fufpicion of any fuch Vitriol, It is true, I have by me 
fome Sorts of rvhite Lead Ore Spar4ike^ plentifully 
yielding Lead ; But I cannot fay that either thofe or 
any coloured Lead Ores, did give me any reafon to 
fufpedl, after diverfe experiments upon them , that 
yielded white Vitriol. 
As to theCryftals of white Vitriol, they are very dif- 
ficult to defcribe, and feemto me to be a congeries of 
infinite fmallNeedleSpfor which reafon it is of a moft fpee- 
dy Operation, and irritates the Stomach fuddenly, be- 
fore they can be well difiblved or broken. 
I recommend the inquiry of both thefe particulars 
concerning white Vitriol, to the Induftry and Diligence 
of the Curious. 
