( ;>4 ) 
XXIV. That Magnetifm not only in touched Iron 
and Steel, but alfoin the Loadftone itfelf, is foon de- 
ftroyed by Fire. 
XXV. That though Fire deftroys fixed Magnetifm 
in Steel or Iron, yet if they are fet to cool in an erect 
Pofture, or rather in the Diredion of the magnetical 
Line, they will gain more or lefs fixed Vertue by the 
Time they are cold ; but elpecially Steel heated to a 
feafoning Height, and in that Pofition cooled fuddenly 
under Water, which I have found to fix its Polarity fo 
throughly, as that with its North Pole held downward, 
it would attrad the North End of a Dial Needle. 
XXVI. That while a Piece of Iron of fome Magni- 
tude is held at one Pole of a Loadftone, it will increafe 
the Attradion of the other Pole thereof, and enable it 
to lift fome what more. 
XXVII. That if either Pole of a Magnet large 
enough, toucheth one End of an oblong Piece of Steel 
(not too big and long for the Magnet eafily to ad on) 
it will tranfmit its own Vertue to the other End of the 
Steel which is fartheft off, and make it a Pole of its 
own Kind, whilft the End which touches the Stone 
has Vertue of the contrary Pole: But the Vertue ufu- 
ally is not fo ftrong in the End which is untouched, as 
in that whi^h is ^ though I do not know but in fome 
Time it may gain more,, and the other lofe fome, un- 
til the Vertue in each End is nearly equal. 
XXVIII. That any Loadftone put into a Difh with 
its Polarity in an horizontal Situation, and the faid 
Difh, with the Stone in it, put to fwim in the Middle 
of a large Veffel of Water, will turn itfelf, with the 
Difh wherein it is, until its South Pole is direded in 
the Horizon towards the magnetical North Pole of the 
central 
