£ of tf>e &rtMMl Pittouttian 



nal conftitution of the excited iron 

 be deftroyed, though the form of 

 the metal be not at all injured, yet 

 the former power of Attra&ion 



(hall be abolilhed, 

 EXP ER. 11. as appears when an > 



excited iron is made 

 red hot in the fire , and fuffered to 

 cool again. 



And here give me leave to take 

 notice of what I have clfewhere re- 

 lated to another purpofe, namely 



that a Loadftone 

 EX PER. III. may ( as I have 



more than once 

 tryed) be eafily deprived by ig- 

 nition of its Power of fenfibly at- 

 tracting Martial bodies, and yet be 

 fcarce, if at all, vifibly changed, but 

 continue a true Loadftone in other 

 capacities, which, according to the 

 vulgar Philofophy ought to depend 

 upon its Subjlavtial Vorm % and the 

 Loadftone thus fpoiled may, not* 

 withftanding this Form, have its 

 Poles altered at pleafure like a 



piece 



