C 279 ) 
Stone fends forth no fort of Rays from its Centre, and 
unite to one another by a quite different Articulation, 
as may be gathered from the Defcription : But here Dr. 
Foley hgs omitted one Remarkable Particular, that I 
muft needs take notice of,' for befides what theDcftor 
Remarks of the bottom or top of each Joynt having a 
large round Concavity or Convexity, that extends it 
felf from the Centre of the Stone within an Inch or two 
of the Angular Circumference ; examining two Joynts 
that were fent up from the place hither to Town, I ob- 
ferved likewift, that the bottom or top of each Joynt 
round this Concavity or Convexity either rifes with an 
eminent Verge or Ridge, if it be Concave in the mid- 
dle ; or if it be Convex, is holiow'd with fuch a fort of 
Grove, as to receive clofely into it all the eminent Ridg^ 
of the next Joynt either above or below it ; fo that 
each Superficies in the Articulations adapt themfelves on 
all fides Co exadiy one to t'other, as 'tis poffible for two 
Bodies, that are only contiguous, and not cohering, but 
moveable from one to another with little more force 
than is requifite to ilir a Body of that Gravity : But 
this peculiar moulding in the Joynts would be far bet- 
ter expreil by a Scetch that Ihould exactly reprefent the 
bottom and top of two of them feparate from each 
other, than by any Defcription confifting of never fo 
many words. 
Some of the Figures of the Plate-ftones Dr. Lijier 
gives us in thcPhilof. TranfaB. N^, 100. feems to have 
tome agreement to the Joynts of thefe Pillars, in being 
Hexagonal, and having in the middle, at top, or bot- 
tom, a round Concave or Convex Superficies, efpecially 
that mark'd Fig, 32. but then 'tis much fmaller, and he 
fpeaks of it as a lingle Plate, without any more Joynts 
found with ir. 
But the Aftroites alfo as well as the Entrochos, differs 
extreamly from our Stone in its fize, or magnitude; 
for 
