by Particles of Copper, which the Water 
brings along with it continually; and a 
Body of Copper at length is fubftituted in 
the room of the Iron that was corroded 
and wafhed away. The Petrifaction of all 
Bodies that were originally of fome other 
Subftance than what they now appear to be, 
was probably produced after a like Manner; 
for it leems highly improbable that any 
Subfiance whatever can, ftriCtly fpeaking, be 
converted into a Subftance of fome other 
Kind, however Appearances may happen to 
impofe upon us. 
Dr. Brown informs us in his Travels, of 
two vitriolic Springs, called the old and 
the new Ziment , riling from a Copper Mine 
in Hungary , which in fourteen Days turn 
Iron left in their Waters into Copper, and 
that too more pure, duCtile, and malleable, 
than any Copper extracted from the Ore: 
that he took out with his own Hands from 
one of thefe Springs the Figure of an Heart, 
which had been put thereinto eleven or 
twelve Days before, and found it as per¬ 
fect Copper as it had been Iron when put 
in. Some, he adds, will not allow this 
to be a Tranfmutation, but argue. That 
the Waters being faturated with a Vitriol 
of Copper, and finding, a Body fo eafy to 
receive it as Iron is, it infinuateth thereinto 
fo far as to divide and precipitate the Iron, 
