200 Arbor Veneris , or, the Copper Tree, 
wicb, in her Search after new Colours, from 
Copper, for painting in Miniature. The 
Scarlet Dyers ufe in their Bufmefs Aqua 
Fortis faturated with Tin, and make no Se¬ 
cret of it j but one of that Trade, who is 
thought to excel in the Richnefs of his Scar¬ 
let, prepares his Aqua Forth after a Manner 
known only to himfelf. In fome of this 
Mrs. Colembine diffolved Copper: and hap¬ 
pening to leave a Piece of Iron in the Mix¬ 
ture, the was furprized with the Branchings 
from it, and (hewed them to my very inge¬ 
nious Friend and Correfpondent Mr. William 
Arderpn , F. R. S. who by her Delire fentaflr 
Account thereof to me, (in June iy$i) and 
with it fome of the fame Aqua Fortis] ; where- 
into 1 put an Halfpenny, and let it remain 
four or five Days according to his Directions ; 
in which Time die Aqua Forth acquired the 
Confidence of Starch of a pale blue Colour ; 
and on applying it to a Nail, in the Manner 
defended already, it might, in a very few 
Minutes, be feen to (hoot out Branches, that 
would continue growing five or fix Days, ac¬ 
cording to the Extenfion of the Fluid; and 
in numberlefs Trials it never failed once. 
The Branches were evidently of a pure and 
finely coloured Copper, rifmgabove the Fluid, 
exactly regular, and perfectly diftind and 
feparate; as the Drawing, which was taken 
from a Production by the fame Liquor, that 
had been growing four Days, will (hew. 
This Aqua Forth 3 which was very clear 
and 
