C 584 ] 
July 20. 1664. 
iC Mr. Ball produced feveral Load-ftones, and 
“ among them two Terrella's, whereof one feem'd 
a to have four Poles, with a Circle pafling between 
“ them, of no Virtue at all. Some of the Com- 
tc pany fuggefted, that it was probable this Stone 
<c conftfted of two Stones, by Nature cemented to- 
“ gether by a Piece that had no Magnetical Quality 
“ in it. ” 
Quary, Whether this Stone can be come at, to 
examine whether it be a Angle or a double Stone ? 
An Account of fome Magnetical Experiments by 
J. T. Delaguliers. 
In the Year 1715, trying fome Experiments upon 
a very large weak Load-ftone, I found that it had 
feveral Poles : Then I tried feveral other Load-ftones, 
and often found four Poles in fuch as had been arm'd 
when I took off their Armour. In large coarfe 
Stones I found fometimes eight, nine, or ten Poles. 
This made me believe all Load-ftones to have feveral 
Poles ; but when I tried my Lord Taifley ’ s (fince 
Earl of Abercorn ) Load-ftones, and other very good 
ones, I then found that homogeneous Load-ftones 
had but two Poles ; thofe that have more being only 
an Aggregate of Magnetical and other Matter, which 
makes an heterogeneous Subftance. Such is the So- 
ciety's great Load-ftone ; for it has feveral Poles. 
X. An 
