( HP ) 
I did iikewife put a little Gold into Aqua Regia, and 
placed the Tube, in which the faid Water and Gold was, 
iri warm Sand, to the end that as much Gold as was pof- 
fible fhould be diffolved 3 but I could obferve no coagu- 
lations in it, but only in fome Particles branching out , 
the Figures of which, by reafon of their fmallnefs, I 
could not perceive. But as to the mingled Salts, of which 
Aqua Regia is compofed, viz. Salt-Petre, Vitriol, and Sal 
Almoniac , I faw abundance of their Salt Particles coagu- 
lated 3 all which had the figures of exa& fquare Diamonds , 
having two (harp and two obtufe Angles 3 they were of 
different Magnitudes, fome fo fmall that they were hardly 
to be perceived with a Microfcope , tnoft of ’em as clear as 
Chryftal, excepting fome very fmall Particles that lay up- 
on them which had no tranfparency. 
Fig. 9. Three of thofe Diamonds of feveral fires are 
represented by ABC, DE and FG, in which we could per- 
ceive a thicknefs, and the Painter has defcribed it ac- 
cordingly : We faw Iikewife fome few Oblong four-fided 
Figures, with two acute and two obtufe Angles, as in 
Fig. ic. HI. 
I imagined that in the abovementioned Figures there 
was no Gold at all, becaufe I fcarce ever difcover’d any 
fuch Figures in Aqua Fortis impregnated with Silver. 
There lay moreover upon, and about the faid Dia- 
monds, long Chryftalline Figures, which I conclude were 
Particles of Salt-Petre. 
