clinc a Man to believe it real Stone, and the rather,becaufQ 
we are informed the Patient Drank much Water. More-* 
over^the follou^ing Experiments upon this matter, do feemc 
to give proof of its being rather of the ordinary Stony Con- 
ftitution, than of tliat which is proper to Animal Ccncretions. 
For Inftance, we firft of all poured upon it ordinary Vi- 
negar, and- it prefently wrought upon it with a hiffing 
iioife, as it did on the petrifyed Water when ■ powder 'd. 
We poured on it Sprit oiVitriol^ and that alfo wrouglit up- 
on it and diffolved it, but let it fall again-, 2iS. Aqud-fortis 
does wlien it has corroded it; which is, agreeable to 
the Relators Account. ' 
But I do not find he ufed Spirit of Salt, for this wroiight 
upon it v€ry v4goroufly, and prefently diffolved it, arid kept 
ib without any Precipitation. 
Thefe Fxperiments do all of them dilT-inguifh this Concrete 
( whatever it be ) from the ordinary Animal On^s^ as the 
Stone in tlie Bladder , KJdney^ the To^hij &c. for thefe will not 
be difroIved,or in theleafl corroded by any of the mentioned 
Acids : Hhd" Spirit of Nitre be a general Menfiruum^thdit dif^ 
lolves them all readily. 
There are fome things yet very flrange, which make thi^ 
Cafe peculiar : Namely that thofe Stones which are genera- 
ted in the habit of the Body, I mean in the very ferous part 
of the Blood, and thofe that pafTed the Bladder have juft the 
fame Nature^ with tlK)fe that are extra h ah tt urn ^ t^tn thofe 
evacuated ex Stoma^ho and ex Ano\ for one as well as the other 
will be prefently corroded, by fo mild an -Acid as plaine Vi- 
negar. 
The Relator in his Amlyfts of thefe^ Stones^ gives an Ac- 
count of fb great a quantity o?" Volatile ^nd fi:<t Salt obtained 
by his diftillation, that thofe tryals do neceffarily make it 
an Aniwial Suhfiance \ which Experiment fb far failed us, 
that I am not fatisfyed as to the matter of Faft, 
Thus we muft at prefent leave the Difcovery imperfe£l, 
for according to the Defcription the Cafe is very iingular ; 
efpe- 
