514 Of Regular Stones. Part III. 
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mends againft the Sore on Childrens Heads, ufually called 
Tinea Puerorum 3 and Ulcers in the Legs. It hath no fenfe 
of Acids. 
The FIBROUS BLOOD-STONE. Hematites. This 
I take to be that particularly, by Pliny call'd Androdamas. 
It hath affinity with the Amianthus, not only in being divi- 
fible into Fibers 5 but in that thefe Fibers are alfo fomewhat 
flexile, and of a greenifli colour. Yet here, they ftand not 
juft parallel, but rather fo as to tend towards one pojnt 3 
like the Styrict in fome forts of Antimony. This Stone is 
alfo altogether infeniible of Acids. Found in Germany, 
Bohemians ilefia 5 among the Iron Mines 3 of an Iron colour, 
a dull red, yellow, and fometimes black. Much celebra- 
ted againft an Hetmopoe. Trailianus prefcribes it ground 
to an impalpable powder, from 9j to §»»jforaDofe. 
A Piece of SPAUD or TARRAS. Schiftus C axillaris \ 
as I call it. It confifteth of white, glofly, and parallel Fi- 
bers. But different from the Amianthus, in that they are 
very brittle 3 nor fo eafily divided. From the Schiftus de- 
(aVin fimt fenbed by Wormius, (a) which is divifible into Plates. And 
Amiantho wnicn Bmtius defcribes, which is yellow. This is pure 
&c. 1 ' white, almoft like polifh'd Silver, and in a thiner piece, 
femiperfpicuous. Being rub'd between ones Fingers, it di- 
vides into an infinite number of Hairs,twenty times fmaller 
than the fmalleft Needle. It ftirs not with Acids : and 
therefore feems neither to be any kind of Gypfum properly 
fo call'd. 
Another Piece of the fame, from Warwick/hire. Given 
by Sir John Hoskins. 
A Piece of HARD TARRAS , from Stinchcombe in 
Gloucefterjhire. Given by the fame Hand. Tis more clofe 
and firm than the former, rather like thofe in SalArmoniac 5 
the Fibers not altogether fo regularly pild$.nor fo white, 
more refembling the Mother of Green Vitriol. 
The fame Analogy as is between Talk? Mufcovy-Glafs,and 
Amianthus : is alfo between the Rhomboid Spar, the Saxum 
Fi/file, and the Tarras. 
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