Part III. Of Regular Stones. 
305 
Mr. Lyfter hath given a particular Account of this 
Stone , and its varieties in feveral Figures 3 publifhed by 
Mr. Oldenburge, (a) together with fome Notes of Mr. Ray 00 phil 
thereupon. Mr. Lyfter found the faireft of them near Bug- *™{' Ni 
thorp and Leppington in Tor^fhire, in a blew Clay. 
The STARRED-STONE. < Aftroites. So called, for that 
being tabulated, or polifli'd to a plain, it appears adorned 
with little Stars, about * or * th of an inch in Diametre. 
Boetius conjectures Pliny to reckon this Stone for a fort of 
Agate. Whether that be fo or no , himfelf is greatly 
miftaken (b) in affirming as much : this being a very fort Q>) Lib - 2 - 
Stone. The fame Author takes notice, as of a ftrange c ' I45 ' 
thing, That this Stone being put into Vinegar (c) will move CO c. *47 
up and down in it. Whereas it proceeds ( as Mr. Lyfter 
alfo obferves of the Afteria, which he calls the Aftroites) ^] B * hl1, 
only from the Ebullition following upon the immerfion : 
and happens to any other Stone difioluble with Acids, if 
immerfed in fmall pieces. 
Another, two inches long, and near as broad, This is 
unpolifh'd, and feems to be but part of a far bigger Stone. 
So that although the figure which Boetius, and fome others 
give, is but fmall, fc. not an inch long : yet is it fometimes 
of good bulk. 
The ASTROCHITES5 polifh'd with the figure of a 
Crofs. The Stars are here more round, than in the former. 
The fpaces between the feveral Stars and Rays, of a dark 
blackiih colour. The Rays or Stars themfelves are pale. And 
alfo furrounded with a toothed Circle $ fo as not unaptly 
to reprefent the Wheel of a Watch : from whence I nave 
nam'd it. 
The imperfect STARRY-STONE. Aftroites Boetio (e) CO -Lib. 2 
quartus. In this the Stars are more obfcure, and fcarce ra- c * ld4 ' 
diated, but rather fpots. But the Stone for fubftance the 
fame as the former. 
The WAVED Stone. Aftroites Boetio (f) tertius 3 but (f) ibid, 
improperly fo call'd. For although it be, for fubftance, 
like the former 5 yet is not adorn d with the likenefs of 
Stars, but of Waves. The feveral Waves are compofed of 
whitifh tranfvers Striae. 
Another, with the S trice more confpicuous. 
The SEIVE-STONE. Lapis Cribriform^. A kind of 
R r Tophus, 
