between a ftone and an earth; but whether the one or 
the other,made of a mixture f I gueis) iomc Salt or o- 
ther, and a pure earth without Stilphur, coagulated in the 
wW^r, and harden'd to perfection by the heats xwSum^ 
mer. Which Ssilt Johannes Hejfus proves by a very co- 
gent argument to be j4lumen liquidum, defcribing it, as 
Matthiolus alio does p , to be a whitijb laUeous Juhjianct 
fomewhat inclining to yellow, that fweats out of the earthy 
and fmells like gotten cheefe: whereof having gather'd a 
quantity at P^^J^^^/i, together with the other Species^ of 
jilum, and kept it a while by him, when he came to 
look on it again, he found it to have loft the fmell, and 
a great part of it changed into AUimen Ilumeum'^: the 
part (I fuppofe) Ihooting into ^^r^^/, and the pure 
earth uniting them, as found in the places wherever gene- 
rated: whether /h?^^!^/^^ from the earth as Fliny and Mat« 
thiolus would have it , j or percolated through rocks y as 
we find it in Wales ^ the veins of it there running through 
arockofftone in hardnefs and colour not unlike fiintK 
And yet it feems to be made of much fuch ^inAlum as that 
of John Hejpis at Puteoli was, fomc of it being //r^?n?- 
colour asifit ftill retain d thcyellownefs that his liquid 
iitumenyia'^iaiAtohavQi which is a colour not given it 
by any Author, moft of it being faid to be white or ciner-- 
eous 5 fome of it red; and fome of an Iron colour as Agri' 
cola tells us ^ ; and I have (ome of the Cyprian by me fent 
! itom Aleppo hj my worthy friend T>v. ^b. Huntington 
now Provojl of Trin. Coll. Dublin whereof fome is ot a 
light ble^ or pearl-colour i and fome of it ha's a caft ot 
-Sea-green. But however the whole mineral lubftances 
found at feveral places may differ in colour ; yet I dos 
\ -not find but the woolly part of them all feems to be much 
^ the fame, vi^. oi a white Silver colour , the threds very fne 
\ J) And, MatthioHComment. in Lib. f. Difcor.cap. 81. Andr.Matthioli Epiftol.Lib. 3. rC. 
? Pliniix'ii. Nat. Hift. Lib. 35'.cap. ij". & Andr/Matthioli Comment, in Lib. 5. Digfcor. cap. 82. 
/Philofoph. Tranfaa. Numb. 166. t Geo. Agricolx dc Nat. Foflil- 1, 5. 
L 1 2 and 
