( 4 59 .) 
the very large Skeleton, found near T)rapani in Sicily, 
and mentioned by Boccatius , on that remarkable one 
found near Tonna , which hath been defcribed by 
Tent ze litis ; as alfo on two Teeth found in Northamp • 
tonjhire , which I fhall next take into conlideration. 
However it doth by no means follow from thence, that 
all Teeth and Subftances of this Kind undergo the 
like Calcination by lying long under Ground, forafmuch 
as there are others, as thofe found in IJland, and fent 
to Thomas Bartholin, which were turned to a perfed 
hard, flinty Subflance. It ferves, in the fecond Place, 
to ascertain the Strudure of thefe Teeth, and confe- 
quently of Ivory in general, to be Layer upon Layer, 
or Coat upon Coat, like the Skins in an Onion, or 
rather the annual Circles, or Rings in Trunks of Trees. 
That this Tooth is compofed of different Coats, fur- 
rounding and placed upon each other, is very apparent 
by the largeft Piece remaining (Fig. i.). I have already 
obferved, that this Piece belonged to the Balls of the 
Tooth, and there appear in it very vilible marks of 
nine Coats, fome whereof have about one tenth of 
an Inch in thicknefs. Towards the further End of 
the Tooth, where it tapers almofl into a Point, thefe fe- 
veral Coats alfo join together into two or three, and thofe 
pretty conliderably thick (Fig. zl). With fome Care thefe 
Coats might be farther fub-divided into a conliderable 
Number of other fmaller ones, perhaps no thicker 
than a common Parchment. Farther, the very man- 
ner of its falling to pieces is an evident Proof of its 
Strudure, all the Fragments being concave within, 
and convex without, and the Lines of Convexity and 
Concavity, Fragments of concentrick Circles, which the 
feveral Coats compofed, when entire. Thomas Bar - 
Q, q q 2* tholin 9 
