fometimes towards the. 'extremesj. and 
fometimes- towardsihe rraidlc; / ■ s 
3. iVs to the place <whferice the Iron- 
matter, comes, fince; that alfo feems Id 
have illued out ohthe pores of fomefoHd 
Body. : . 
4. AsV to the manner by which the 
fame mattor by meais of the fermupin^ 
fluid, is determined towards: the, Solid, 
and by the motion, of the amhient: £lui.d is 
extehdedinto a plaih,-and made fiftoothi-. 
Thef difir aS tof alter and Figurot 
^or, Chrydal-matter is diaphanous,.but 
the matter of Iron is opaque. Thu Fi-; 
gure of Chr^ftal is of Eighteen plains, 
the; e; extremes of Which plains am 
polifliedj but the fix intermediate ftrea- 
ked .i f But in the Second fort of Iron 
there are counted Twelve plains, fix? 
whereof are the extremes and ftreaked, 
the other fix the intermediate, and poll- 
flied ; And in the Thfird fort of Iron 
there are reckoned Twenty-four plains, 
the fix extremes whereof arc ftreaked, 
the iflitermediate eighteen polifhedj. 
fi)metinics between the extreme ftreafeed 
plains there lye fix,ote iOb!ining plains. 
