P Art III. Of Regular Stones. 
305 
Mr. Lyfter liath 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 (*) phiL 
thereupon. Mr. Lyfter found the faireft of them near Bug- ™{' Nr 
thorp and Leppington in Tor^fhire, in a blew Clay. 
The STARRED-STONE. Aftroites. So called, for that 
being tabulated, or poliftfd 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 foil (b) 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 G, 147- 
up and down in it. Whereas it proceeds ( as Mr. Lyfter 
alfo obferves of the Afteria, which he calls the Aftroites) 
only from the Ebullition following upon the immerfion : 
and happens to any other Stone diffoluble with Acids, if 
immerfed in fmall pieces. 
Another, two inches long, and near as broad , This is 
unpolled, 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 ASTROCHITES3 poliftrd 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 
blackilh colour. The Rays or Stars themfelves are pale. And 
alfo furrounded with a toothed Circle 3 fo as not unaptly 
to rcprefent the Wheel of a Watch : from whence I have 
nam a it. 
The imperfect STARRY-STONE. Aftroites Boetio (e) CO Lib. 1. 
quartus. In this the Stars are more obfeure, and fcarce ra- c * l6¥ 
diated, but rather fpots. But the Stone for fubftance the 
fame as the former. 
The WAVED Stone. Aftroites Boetio (f) tertius 5 but (f) ibid, 
improperly fo call'd. For although it be, for fubftance, 
like the former 3 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 Stria more confpicuous. 
The SEIVE-STONE. Lapis Cribriform^. A kind of 
R r Tophus. 
