t¥mr interdHmqutfe tanquam Aftroitcs mmeat de teco^^xiX this 
is true of all Foffils of what figure fo ever, that Viqegar will 
corrode and diflblve as a Menftruum ; provided they bier brok- 
ca into indifFercot ftnall graips^and the bottom of the V^flel 
hinder not 3 they will be moved from place to place by it* 
The figure of the trochiu is cyliadxicalithe outmofl round 
or Circle (we fpeak of one fingle joyor, s^\\ich Airkola calls 
W0€hiHs)h m gene ral fmooth , both the flat-fides are thick 
drawn with fiae and /mall rayes , from a certain hole in the! 
middle to the circumference^ From the fhootiog of thefe 
raycs like Antimonie ^ and bccaufe a large Peice of this 
Stone of many joynts refembles the bole of a Trcej Aldrovan- 
dus (^who yet elfe where difcourfes of this Sfone^ after Agrico^ 
laznd Gefner^ under the name of Trochiu and Entrochi) not 
improperly terms it {MufM MtiaUici lib. i.pag. 188, ) Stele- 
whites stihii facie 5 and there gives us a true figure of it. Twp^ 
three^ or more of thefe Tr<7^'A/7<cjoy^ together, make u® 
that other Stone, which he csAU Entrochi The Trochiu ot 
fiogle joyntstfre foicttogetber.tbat the Rayes of the one en- 
ter into the others Furrows, as in the Sutures of the skuIK Hi- 
therto we agree to what /f^r^W^, Gefmr^BoetiHs^ Mdrovan^ 
4us andWormiushzvtkiA oi them: We proceed upoo our 
own Obfcrvations, which go much further. 
The Places where we find them very plentifully , are ccX" 
mnScmtsmBraiighton^iXid stock, Httle Villages in Craven. 
TheStonesof the abovcfaid defcribed Figure 5 as many as 
have yet come to my hands from thofe places, have afforded 
us thefe Particulars, As to their bignefs^ I never yet met with 
®ny much above two inches about 5 others there are as fmall 
as the fmalleft pinn , and of all magnitudes betwixt thofe pro- 
port icns^They are all broken bodies ^ fome ftiorter Picces/ome 
Knger, and fomc of them, indeed, ^r^^to^^ that is, but fio- 
gle joynts. I never found one iot ire piece much above two 
inches long, and that very rarely too ; in fome of which long 
pieces I have reckned about 30 joynts. And as they are 
all broken bodies, fo are they found and lying con- 
tiilcdly in the Rock^ which in fome places, where they are to 
behad, IS as hard as Marble, in other places fof t and My (n 
they call ir,) that is, rotten and periflied with the wet and air. 
