Of 0 XFO^t^^SHI'KE. 8p 
how they differ from one another, let Us now confider them all 
together in that admired quality of their moving in Vinegar^ which 
in fome meafure is found in the Aftroites, but is much more fignal 
in the A/Ieride or (lar-flones' for the Afiroites muft be broken in 
very fmall pieces before they v^ill move, though put in good Vi- 
negar, but the Jfteria will move not only in a wholt joynt^ bur two 
or three of them knit together, which 1 have often feen done by 
the yellow ones of Ckydon, though of greater bulk than thofe 
of other places ; which joined, with fome other circumftances 
anon to be mentioned, has given me ground to fufped, it not 
conclude, that though it may be true enough what Mr. Lifter 
hasaiferted, as well of iWfoffils, as the Hones afiroites, that as 
many of them as Vinegar will corrode as a Men[iruum, do all move 
in it ; yet none of them reach the efleds it has on the Jfteria, to 
which therefore I muft crave leave to allow fomwhat more than 
either to the Jftr cites or any otheic fc/Ids. 
27. For befide the progreffive motion to be feen in thofe, the 
Jfteria has a motion of circumgyration, and moves brisker and 
longer than any of them; for though it hath been fteened in 
Fi//f^^irthreeor four days, yet upon infufion of a fredi ^ci^, it 
ftill fends forth many Y\^\\^, bubbles zi firft, from iindcrne ith 
it, in the inftant of its motion : which feems to argue, that it 
has it not wholly from the corrofion of the Menftruum, bur in: 
part at leaft from fome other principle, which I take to be a /^i- 
rituoiM, yet corporeal effluvium, continually flowing from it, when 
provoked by an acid, 
28. Whereof there is one, which hereafter (hall be pubhck, 
found out indeed by chance at the Houfe of Mr. Wildgofe, Fhyfi- 
tianztVentori^ and an ingenious Chymift, whofe affiftances (in 
gratitude) I muft ever own : where not having Vinegar fo ready 
at hand, we thought fit to make ufe of another fuitable liquor, 
which fo effeftually excited the effluviums of the ftone, that they 
afcerided in a cloud to the furface of the Menflruum, and there 
fetledexadly in the form of the fldne, and that not only of a fm- 
gkjoynt, but a whole column of them together : which perfwa- 
ded me, that Cardan ° was not fo far out of the way, nor defer ved 
fomuch the reproofs o^^ J I drov an du6^ znd others , for afferting 
the motion of fuch ftones to arife, from vapors expelled from 
^ Philofoph.Tranfafi'Numli. 100. ° SuUdit- Lib. ^ 
M them 
