Of XFO^V^SHI^E. S 9 



how they differ from one another^ let us now con/idcr 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 fignai 

 in the Afleride or ftar-iiories : for the Afiroites mud be broken in 

 very fmall pieces before they will niove, though put in good Vi* 

 negar, but the Afteria will move not only in a whole joynt, but two 

 or three of them knit together, which 1 have often feen done by 

 the yellow ones of Cleydon, though of greater bulk than thofe 

 of other places ; which joined, with fome other circumftances 

 anon to be mention 'd, has given me ground to fufpecf, if not 

 conclude, that though it may be true enough what Mr* Lifter n 

 has aflerted, as well of 7\\fo(fils, as the ftones Aftroites, that as 

 many of them as Vinegar will corrode as a Menftruum, do all movd 

 in it ; yet nOne of them reach the effefts it has on the Afteria, to 

 which therefore I muft crave leave to allow fomwhat more than 

 either to the Aftroites or any other fofjds. 



27. For befide the progreffive motion to be feen in thofe, the 

 Afteria has a motion of circumgyration, and moves brisker and 

 longer than any of them ? - for though it hath been fteeped in 

 Vinegar three or four days, yet upon infufion of a frefli acid, it 

 ftill fends forth many little bubbles -as at firft, from underneath 

 it, in the inftant of its motion ; which feems to argue, that it 

 has it not wholly from the corrofion of the Menftruum, but in 

 part at leaft from fome other principle, which I take to be a fpi~ 

 rituows, yet corporeal effluvium, continually flowing from it, when 

 provoked by an acid. 



28. Whereof there is one, which hereafter (hall be publick, 

 found out indeed by chance at the Houfe of Mr. Wildgofe, Phyfi^ 

 tian at Denton, 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 

 afcended in a cloud to the furface of the Menftruum, and there 

 feded exa&ly in the form of the ftone, and that not only of a fin- 

 gle joynt, but a whole column of them together : which perfwa- 

 ded me, that Cardan was notfo far out of the way, nor defer ved 

 fomuch the reproofs of Aldrovandws* and others, forafferting 

 the motion of fuch ftones to arife, from vapors expelled from 



Philofoph.Tranfatt.Num&. 100. Subtilit- Lib. 5. t Mufaum Metallic-lib. \.cap.6<$. 



M them 



