( 1440 ) 
Circumference than in the middle, and had alfo feyeral 
Fvings or Circumferences, which does ftill the more confirm 
me in the opinion of thofe fecret Inclinations of like Bo- 
dies, and thus in their increafe they prefer ve the fame Fi- 
gure which the fingle Salts had put on at their firft Coagu- 
lation. 
Into fuch Water I alfo put a little piece of Copper, and 
obfervYi that immediately the Gold had partly united itfelf 
to the Copper, but the Aqua, Regia had not fo much power 
over the Copper as to protrude out of its fubftance lo many 
Air-bubbles, as it might otherwife have done if there had 
not been fo much Gold therein 3 the faid Water had there- 
upon affum*d a greenifh colour, and all the yellow colour 
was turned into Coagulated Gold, infomuch that one might 
with the naked eye diftinguifh the Gold from the Copper, 
particularly the extream parts of the little Boughs which 
were made by the Coagulated Gold, altho the faid Coagu- 
lated Gold confifted of Particles that were fo very' fmall and 
minute, that they did not appear larger with the help of a 
good Microfcope than the fmalleft grains of Sand to tha 
naked Eye. 
When I weaken d with Rain Water the Aqna Regia which 
had been impregnated with a great deal of Gold, and then 
put into it a bit of Copper, I obferv'd that the Gold in a 
(hort time was coagulated or united with the Copper, and 
that the Water was turn'd to a light green-. 
I have alfo obferv'd that the fmall Twigs of thefe Coa- 
gulated Particles were not of a fine Gold colonr,from whence 
I inferred that there was Copper blended together in them. 
The faid Aqm Regia which had been impregnated with 
Gold, having remained fome days in the Glafs, I perceiv'd 
that where it was thickeft,it was covered with a Film or Skin, 
and that moft of the Salts when the Weather was not warm, 
nor the Sun (hind, were diflblv'd, and much more in Rainy 
Weather, ■ ■ 
Moreover, I expos'd the Glafs with the faid Water to fuch 
a 
