E 11 1 
and a repulfive Power on the other, fomething find- 
jar to the Loadftone; and this I was firft of all in- 
duced to believe, from what Sir Ifaac Newton cb- 
lerves in his Opticks, gu. 31. 
XXV. 
hii ■■■ iKf : \d\ 
When any faline Liquor ( fays \ he) is evaporated 
to a Cuticle, and let cool, the Salt concretes in re^ 
gular Figures 5 whic^i argues, that the Particles of the 
Salt, before they concreted, floated in the Liquor, 
at equal Diftances, in Rank and File $ - and by Con- 
fequence, that they aded upon one another by feme 
Power, which at equal Diftances is equal, at unequal 
Diftances is unequal: For, by fuch a Power, they will 
range themfelves uniformly, and without it they will 
float irregularly, and come together as irregularly. And 
fincethe Particles of Chryftal ad all the fame 
Way upon the Rays of Light, for caufing the un- 
ufual Refradion, may it not be fuppofed, that in 
the Formation of this Chryftal, the Particles not only 
ranged themfelves in Rank and File for concreting 
in regular Figures, but alfo, by fome kind of polar 
Virtue, turned their homogeneal Sides the fame 
Way * 
XXVI. 
And again, we are taught by the fame Great Man, 
that Fire is the moft Ample of all known Bodies, 
and confequently the moft immutable 5 that each 
Ray of Fire or Light has Sides differently affeded, 
and which have different Properties 5 and that Iceland 
B z Chryftal 
