514 Of Regular Stones. Part III. 
mends againf^ the Sore on Childrens Heads, ufually called 
Tinea Fueroruni 3 and Ulcers in the Legs. It hath no fenfs 
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- 
sible into Fibers 5 but in that thefe Fibers are alfo fomewhat 
flexile, and of a greenifh colour. Yet here, they ftand not 
juft parallel, but rather fo as to tend towards one point 3 
like the Styri<z in feme forts of Antimony. This Stone is 
alfo altogether infenfible of Acids. Found in Germany, 
Bohemia^ ilefia 3 among the Iron Mines 3 of an Iron colour, 
a dull red, yellow, and fometimes black. Much celebra- 
ted againft an Hctmoptoe. Trallianus prefcribes it ground 
to an impalpable powder, from 9j to for aDofe. 
A Piece of SPAUD or T ARRAS. Schijlw C axillaris h 
as I call it. ft 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- 
( a y in fine, fcribed by Wormius, (a) which is diviiible into Plates. And 
Araantho ^ iat wn * cn B oet * us defcribes, which is yellow. This is pure 
6cc. ' white, almoft like poliftui 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 called. 
Another Piece of the fame, from Warwickshire. Given 
by Sir John Hoskjns. 
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 5 nor fo white, 
more refembling the Mother of Green Vitriol. 
The fame Analogy as is between Talk, Mufcovy-Glafs,md 
Amianthus: is alfo between the Rhomboid Spar 7 thcSaxum 
Fijffile, and the Tarras* 
CHAP. 
