£0f Arbor Veneris, or, the Copper Tree, 
like the EfFedfc, the fame Mixture may then 
be made in a large Quantity and kept in a 
Phial to entertain them at any Time ; for all 
thefe Mixtures may be preferved in good 
Condition many Months 
It may be proper to obferve in general, 
that thole Mixtures are the mod; agreeable 
which have fome Body or Confidence; and 
that fuch Confidence is given by adding a 
Solution of Mercury to the Copper Solution, 
and then putting in Salt Ammoniac; or by 
difiolving Tin in the Menftruum before the 
Copper is put in. if the Mixture corrodes' 
the Nail it never does well; or if it turns 
green round the Sides thereof, which it will 
do when overcharged with Salt Ammoniac ; 
but defpair not of any Nail’s fhooting till it 
has lain twelve Hours. 
If you can procure Aqua Fortis that will 
diffolve and fufpend Tin , (not burn it into a 
white Powder) the whole depends on leav¬ 
ing it of fuch due Strength, that it may be 
able to diffolve Copper enough, after it has 
dififolved the Tin, and yet not be fo ftrong 
as to corrode and raife Blifters on the Nail 
fficiftened therewith, thereby difcolouring 
the Copper and fpoiling the Experiment. 
* ’Tis belt to keep all Mixtures with sc"d Spirits in a 
little Box by themfelves, and in Phials (holding an Ounce 
at lead) not more than half filled • for fome of them will 
ferment and ftand in need of room: they ftiould alfo have 
well fitted Qlafs Stopples. 
On 
