of Sptgnetifm* 17 



fitter than other, to a convenient ihape, 

 though, till it was altered by the fire, it 

 difcovered no Magnetical Quality, yet af- 

 ter it had been kept red-hot in the fire 

 and was fuffered to cool in a convenient 

 pofture, it was enabled toexercife Magne- 

 tical operations upon a pois'd Needle. 



A 



EX PER. XIII. 



S for the Abolition of the Magneti- 

 cal vertue in a body endowed with 

 it, it may be made without deftroying the 

 Subftantial or the Eflential Form of the 

 body, and without fenfibly adding, dimi- 

 nifhing, or altering any thing in reference 

 to the Salt, Sulphur and Mercury, which 

 Chymifti prefume Iron and Steel, as well 

 as other mixt bodies, to be compofed of. 

 For it has been fometimes obferved, that 

 the bare continuance of a Loadftone it felf 

 in a contrary pofition to that, which, 

 when freely placed,it feems to effe6t, has 

 either corrupted or fenfibly leffened the 

 vertue of it. What I formerly obferved 

 to this purpofe> I elfewhere relate, and 

 fince that having a Loadftone, whofe vi- 

 gor was look'd upon by skilful perfons as 

 very extraordinary, and which, whilft it 

 was in an Artificers hand, was therefore 

 held at a high rate, I was careful, being 



by 



