OfOXFO %T)^S HI 14J 
they lye fcatter'd here and there of divers bigneffes, fo artifi- 
cially by Nature shaped round in manner of a Globe, that one 
would take them to be great bullets^ cail for fiot^ to be dif- 
charged out of great Ordnance. Such as thefe are alfo mention'd 
by Job. Kentmannu6^ foMnA inter lapides <£rano^. which if broken 
(fays he) are like the filver or cinerepm Manhafite^ out of which 
fonitimes ^rj/? or [ilver-^xt fmelted^\ than which ours are fom- 
what of a better colour, but whether poffei]: with thofe or a 
better metals I muftconfefs 1 have not tryed, and therefore can- 
not inform the Reader, 
180. Hither alfo muft be referred a round ftone before men- 
tioned, chap. 3 fe^. 30. containing within it a white fort of 
earthy and therefore called GeodeSy or the pregnant Hone ; differ- 
ing from the Mtites in this, that whereas that has within it a 
movable Jione., by the Naturalifts called Callmm ; this contains 
only earth or fand^ that moves not at all : The outward cruil of 
thefe is fom times only an indurated chalk_^ under which are fome 
other folds like the coats of an Onyon ; and when found thus, by 
the Inhabitants of the Chiltern (where they are moft plentiful) 
they are called chalk. Eggs. Others there are of them, whofe 
outermoft co^/^ are hard black Flints, fome very thin, and others 
thicker, according I fuppofe to the feniority of their generation : 
For 1 have iome of them by me whofe coats are not much thicker 
than the shell of a Wall-nut^ others ftone half way, and others 
fo almoft tothe very ce;2/er; and thefe '^\\nt coats black without 
fide, and gradually whiter and whiter, as they approach nearer 
to the whitidi earth contained within : whence I am almoft per- 
fwaded, that however it may be in irregular Flints, that in thefe 
the chalky matter does turn into fione., and is the chief principle 
of their gcaeration. 
1 8 1 . Upon the Chiltern-hills^ near to Sherhourn and Lewkner^ 
I found many of the Flints inclining to a Conical Figure. And 
in the gravel about Oxford^ I have feen fafciated Pebbles, having 
as it were Zones ox girdles round them, of different colours from 
thofe of the flones. About Fawler and Stmsjield^ the Pebbles 
before mentioned, cap. ^.je^.. 18. are moft of them ftreaked with 
iron- colour' d lines^ fomtimes inclining towards one another like 
the ramifications of a Dendrites ; which though not fo curious as 
P Catalog. T^il'ium, Tit. l6- de Lfipid. arariii a natura e^giatif, 
the 
