Arbor Veneris , or, the Copper Tree. 197 
ally larger for Hours or Days, in propor¬ 
tion to the Extenfion of the Liquor round 
the Iron. For the Copper Particles afloat in 
the Fluid, being firft'of all attracted to cer¬ 
tain Points in the Iron, and afterwards at¬ 
tracting one another in an orderly Succef- 
fion, arrange themfelves, by the Influence 
and Co-operation of the Salts wherewith 
they are now joined, in fuch Manner, as 
to compofe by juxta-pojition a Refemhlance 
of the mold regular and beautiful Vegetation. 
And this Attraction and Formation of new 
Branches Teems to go on, until all the Cop¬ 
per Particles in the Fluid are attracted and 
difpofed by one another in the fame wonder¬ 
ful Direction and Order. 
Left I fhould not have expreffed myfelf 
with fufficient Clearnefs to be perfectly ua- 
derftood, I have given a Drawing, taken 
with confiderable ExaCtnefs, of one of thefe 
Productions, which now lies before me, and 
has been growing four Days: (fee Plate 
the laft) this will fhew the Manner of plac¬ 
ing the Nail, and fpreading the Liquor round 
it, and likewife what may be expeCted from 
it. The Drawing is not magnified, but 
the real Size of the QbjeCt, which is large 
enough to be feen plainly by the naked 
Eve. 
j 
The chief Difficulty in this Experiment 
arifes from the great Difference in the 
Strength and Manner of the Aqua Fortis's 
being prepared at different Shops, and even at 
0 3 the 
