i 96 Arbor Venerisy or, the Copper *Tree. 
Have ready fome Salt Ammoniac finely 
powdered, whereof put in a very little at a 
Time, {birring it about till it diffolves, makes 
the Mixture of a blueifh white, and gives it 
a Coniiftence like to Starch ; which Con¬ 
dition fhews it fit for your Purpofe. 
File bright any fmall Piece of Iron, 
(the pointed End of a Nail about an Inch 
in Length, or a fmall Nail of that Length 
called a Brady does as well as any Thing) 
place it on the Middle of a Piece of clear 
Glafs of two or three Inches in Width : then 
ftirring the Mixture with a Quill, let a 
Drop fall from the End of the Quill upon 
the Iron, and wet it therewith all over (or 
dip the Iron in the Mixture, before you lay 
it on the Glafs, till it appears of a Copper 
Colour,) add another Drop or two of the 
Mixture, and with your Quill fpread it to 
equal Diflances from every Side of the Iron, 
an Inch or more, laying it fo thin as to 
be tranfparent. Let it remain quiet in an 
horizontal Pofition, and in a little while 
you will difcern with' the naked Eye Rami¬ 
fications of the purefb Copper {hooting from 
the Sides of the Iron, refembling the moil 
elegant Branchings feen in Mocha Stones , 
(which may perhaps be produced by Mix¬ 
tures in the Earth fomewhat a-kin to thefe) 
or like fome of the moft minute and deli¬ 
cate Sea-moiles, They will grow continu- 
