Part III. Of Regular Stoner. 313 
of Plates or Crufts narrowed from the middle of the Stone 
both ways, fo as to make that Figure. A fecond, Oval, 
with three Hemifpherick knobs appendent 3 all plated, as 
the Globular. A fourth and fifth figur’d almoif like a 
Finger. 
THUS FAR of Plated Stories. Next of thofe which 
We may call Fibrous. In the former,the Parts are anfwerable 
to the leaves in a piece of Paft-board. In thefe to the Briftles 
in a Brujh, or the Threads in a Skeine of Silk, 
THRUM-STONE,as I call it. Amianthus Lapis Is 1 Asbefti- 
nus. It grows in fhort Threads or Thrums, from about a 
I of an inch to an inch in length; parallel,and glolfy; as fine, 
as thofe fmall fingle Threads the SilkWorm fpins3 and 
very flexile, like Flax or Tow. Nothing anfwers it better, 
than the hard fibrous part of a large Oyfier , when ’tis ftew’d. 
Here are feveral pieces, both of White and Green. Of 
which, the latter hath the longeft Threads, and the moft 
flexile. 
A piece of AMIANTHUS-ROCK 3 in which the Thrums 
( about i of an inch in length) lie in Layers between feveral 
Beds of a Green Stone,in fome places of a rediih brown. 
Another, with Veins or Layers between Beds of a blewiih 
colour. 
A BASTARD-AMIANTHUS. It grows in Veins in a 
Claiy and Mundick Load, between Beds of a Greeniih 
Earth. The Threads' d or near 1 an inch long, of a glofly 
black, and brittle. Given by Mr. Coleprefi, who obferv’d • 
it amongft the Cornifh Mines. 
The beft is found in Cyprus and India. Of late, very 
good in fome Mines in Italy. Of which fee the Philof. 
Tranfactions. (a) It was anciently fpun, like Tow , into Sheets 3 O) Num.72. 
in which the Bodies of Princes, laid on the Funeral Pile, 
were wrapped up, to keep them entire, when they were 
burnt, from the other allies. Thefe Sheets were made clean, 
not by walking, but by burning them 3 as being infuper- 
able by the fire: from whence <he Name of the Stone. 
The Art, as well as the Ufe, is thought to begone. But 
notfo5 for Sept alius (b) hath or lately had both Thread, (i>) Mufcum 
Ropes, Paper, and Netted-Works all made hereof 5 and fome 
of them with his own hand. Boetius defenbes (c) an ( c ) Lib.de 
Oyntment made of this Stone, which he highly com- Lap. & Gem, 
S f mends 
