( *i8 ) 
are Convex as well at Top as at Bottom : But tlic gene- 
ral Formation that's moft conftant and runs through al- 
moft all the Pillars of the Caufway, agrees with what is 
faid in the fore- mentioned Tranfailtont viz. That if a 
Joint he Concave at one End, the other End is always Con, 
vex. And bating thefe Particulars I have hinted, I do 
not fee any thing el(e faid in that Account that you may 
not fafely rely on. 
The vaft Towering Height of thefe ftrait Jointed Pil- 
lars, efpecially of thole that are moft flender and the per- 
fedeft among them, is truly very furprizing, and de- 
ferves yet a more particular Regard. There are in the 
Caufways, fome of Thirty Two, others of Thirty Six 
Foot High above the Strand, and as I faid before, fome 
among the Organs ^c^mX Forty Foot in Height : How far 
theft may be continued under Ground is not yet difco- 
vered, nor has it been fo well examined as it ought : A 
Gentleman of my Acquaintance in thoft Parts, did me 
the Favour lately to trace one of the talleft Pillars of the 
Caufway, by digging into the Strand till he could well 
go no farther ; and it continued ftill of the fame Make 
and Figure, Jointed as it was above, for the Depth of 
Eight Foot together, and could he then conveniently have 
gone on with his Defign, and followed it deeper, he tells 
me he had no Reafon to doubt but he might ftifl have 
traced it much farther into the Earth. This is obftrva- 
ble, that commonly the Joints as well of the In-land 
ViUars^ as thofe of the Caufway^ as they have their Si- 
tuation nigher the Earthy are longer and taller than thofe 
towards the Top of the Colum, but no difference is ob- 
ferved in the Cavities or Rifiogs of the Joints, as they 
are placed higher or lower in the fame Pillar, they con- 
tinue much the fame as to their Depth or Protuberance 
from Tqp to Bottom : yet the utmoft Top of fuch of 
the Pillars that feem coimpleat and intire, always termu 
fiates 
