of ^agnettftm 5 



piece of Iron i as I have elfe- 

 where particularly declared. 



And I will confirm what I have 

 been faying with an experiment that 

 you do not perhaps expeft ; namely, 

 that though it be generally taken 

 for granted ( without being contra- 

 dicted that I know of by any man ) 

 that, in afoundLoadftone, that has 

 never been injured by the fire, not 

 only the attra&ive Power, but the 

 particular Vertue that it has to 

 point conftantly , when left to it 

 felfj with one of its determinate ex- 

 treams to one determinate pole, 

 flowes immediately from the fub- 

 (tantiai or at lealt effential Form 3 

 yet this Form remaining undeftroy- 

 ed by Fire, the Poles may be chan- 

 ged, and that with eafe and fpeed. 

 For among my notes about Magne- 

 tical Experiments, whence I bor- 

 row fome pafTages of this paper, I 

 find the following Account. 



Ex* 



