( ) 
branches as appeard in the abovefaid Water by the help of 
ray Microfcope, trora whence^ I am the niore fully confirmed 
in my hypothefis, that when the parts of that Stone were a 
floid iabftanGe, the Silver Particles were tlfo mingl'd with 
them, and when the Stone came to conlolidate, the Silver 
alfo was coagulatec|, in Branches juft as we fee it now lying 
in the Stone, wli^r^with it is forrounded, and as it were 
imprifon'd j from ; \vhenGe feveral have conceited that in 
procefs of time the Silver grew in the faid Stone. 
In the Philofofhkal TranfaSions No 245. p. 298. I ob- 
ferve that Sir Robert Southmll^ ,.a Member of thQ Royal So'^ 
ciety^ had acquainted that Body, that he had feen a Gold 
Ducat beaten very thin, and then diffolv'd in two Ounces 
of Aqua, Regiuy into which wasftcept a Linnen Rag and then 
dried, and then fteept again, and as often dried, til! it had 
fKckt up all the faid Water ^ after which they burnt the 
Gloath to Tinder, and fo gilded ihe Silver, by rubbing it 
with the Afhes or remaining matter ot the faid Linnen. 
I took a piece of Gold and threw it into a proportionable 
quantity of AquaRegia^ in the diffolvingof v/hich I faw 
Air-bubbles afcending in like manner asl faid before of the 
Silver. 
After a little time I took fome of the Aqud Regia thus im- 
pregnated, and laid it on a clean Glafs, toobferve, after the 
mingl'd Salts were coagulated, what Gold Particles I could 
difcover therein. 
When it was fair warm weather the Salts were for tlie 
moft part coagulated, but in fo many feveral forts of fi- 
gures that they were hardly to be accounted for, fometimes 
th^y reprefented an exaft Hexangular Figure, by and by the 
very fame Figures were no lefs irregular 5 the occafion of 
which was, as I conceive, becaufe the Coalefcence of new 
Particles was not equal on every fide^ but that which was 
the moft remarkable was, that upon thelc Salt Particles, that 
were as tranfparent as yellow Cryftai,. there lay other Salt 
Particles ofia iine GjQld colpurs^nd fametimes they appear^} 
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