Of OXFO%T>.SHI%E. 87 
oneanother. In the center of the five angles is a fmail hole, con - 
fpicuous enough in mod of them; but in fome Ihave obferved 
the fmall hole on one fide, and a little prominency on the other, 
fit as it were to be let in to the Central-hole of the next joynt^ after 
the manner of the ridges and furrows of the angles, 
20. Many of thefelongeft jointed AfterU^ have certainyoj/z/s 
a thought broader and more prominent than others, dividing the 
whole body as it were into certain conjugations^ of two, three, 
or mox^ joynts ; which conjugations^ fays the learned and curious 
Obferver, Mr. Lifter \ are marked (as he calls them) with fets 
of Wyers^ which though I could not perceive in any found at 
Cleydon^ yet when I put a column of them into Vinegar^ at thofc 
very places I could perceive bubbles^ {landing as it were at the ori- 
fices^ where formerly thtfeWyers were in all likelyhood inferted, 
by no means otherwifc vifible to the eye. And whereas 'tis cer- 
tain that moft of thefe in other CottW//V^, if of any confiderable 
length, are notftraight, but vifibly bent and inclining; thefe 
are not now, or fcarce appear to have ever been fo, though pof- 
fibly this may rather be referred to the (liortnefs of thofe I met 
with, or ill luck in finding none of the kind, than to any diffe- 
rent operation in nature here, from her ufual performances in o- 
ther places. 
21. They are found alfo about Swerford of the fame colour, 
but nothing fo plentifully, or large as thefe at Cleydon, for the 
biggeft i found there was fcarce an inch round ; in all other re- 
fpefts they correfpond with them, only the conjugations^ made 
by the prominence of {omt joynts beyond the reft, are more vifi- 
ble in thefe than in any at Cleydon. 
22. Of Ailroites or Harry-ftones^ fuch as in bulk are irregular^ 
but adorned all over with many ftars^ there are no lefs in this 
County than four feveral forts 1 Whereof, in two, theftars are in 
mez^Zp Rilievo^ prominent, and ftanding outward, withthey?r/> 
or ftreaks defcending from the Center at the top, on all fides to 
the Rock on which they grow. Some of thefe are of a larger, 
as Jj^. 2. Fig. 4. and others of a fmaller kind, ^sTab.2. Fig.'^. 
both found in the Quarries of rubble-ftone^ dug only for mend- 
ing the High-ways, not far from the foot of Shot-over UilU on 
the right hand of the road from Oxford to London.^ in the Pariili 
of HeddingtOn, ^ philofo^h.Tran/^a. toco drato. : 
23, A 
