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was taken out of the Rock. I had alfo in the fame Cabinet like p-^t 
ces of the ordinary Fire-ftone or Marcafitc of the Coal-pits, which 
here wc call Brafs lumps. In procefs of time both thefe Gkbes (hot 
forth Tufts of long and flcnder fibres or threads 5 feme of them half 
an inch long, bended and curled like hairs. In both thefe Glebes, 
thefe Tufts were in fome meafure tranfparent and cry ftallintr. Thefe 
Tufcs did as often repullu!ate,as they were ftruck and wiped clean 
off. 
Herein thefe fibres differed in tail • the Alluminous very AHomy 
and pleafantly pungent^the Vitriolick fteptique and odioys: Again, 
the Allom-ones,being diflblv'd infair water,raifedafealfebtllli1•^- 
on;whereas the Vitriolick fibres diffolved quietly. The AHom*fi- 
bres weregenerally fmaller,andmoreopaque,fnow-like5 the Vitri*. 
olick larger, many fibres equalling an horfe-hair in thicknefs, and 
more cryftalline. 
The water, wherein the Allom-fibres were difTolv'd, did give no 
red Tinfture with Gall 5 not by all the means I could devife to aflift 
them ; whatever hath (and that with great confidence) been faid to 
the contrary, by fonie of the Writers of our Torkjhire Spaws ; The 
Vitriolick did immediately give a purple tinflure with Gall. 
Having laid pieces of the fame Marcafite in a Cellar, they were 
in a few moneths cover'd over \v\thgreen Copperas^ which was theft 
Fibres fhot and agaw diffolved by the moift Air, dodder 'd and run 
together. 
Expofing other pieces of thefame Vitriolick Glebe in mywin- 
<low, where the Sun came, they were cover'd over with a white fa- 
rinaceous matter^ that is, with thefe Fibres calcined by the rays of 
the Sun and warm Air, beating upon them. 
Of what jf^^ri? thefe Fibres were, whether round or angular, I 
could not well difcern. But I take thefe fibrous and thread-like 
Ihootingsof Allom and Vitriol to be moft genuine and natural ; 
and their Angular fhoorings, after folution, into Cubes and Rhom- 
boides, to be forc't and accidental ; Salts of very different natures, 
as welt Vegetable as Fofille, by a likeprocefs in cryftallizing of 
then],being obfcrv'd to fhoot into like figures. But this isnot my 
purpofeacthis time* 
II» Of an odd figured Y^\S. See Fig.3. and 4. 
I have not obferv'd any Rock or fort of flone, whether Metal- 
line or more Vulgar,which hath not its different fort of Spdnfiioi m 
fome part or other of its bed or feams. And thefe Sparrs differnot 
only in their Colours and other accidents, but eminently too in their 
Figure. ' 
