1 6 flDf t$e ^etijanical p?otmttton 



But whatever be the true caufe of 

 the difparity of the fires operation 

 upon a found Loadftone and a bar of 

 Iron, the effedt Teems to ftrengthen 

 our conje&ure, That Magnetical o- 

 perations may much depend upon 

 Mechanical Principles. And I hope 

 you will find further probability ad- 

 ded to it, by fome Phenomena reci- 

 ted in another paper , to which I 

 once committed fome promifcuous 

 Experiments and Obfervations Mag- 

 netical. 



EXPER. XIL 



IF I may be allowed to borrow an 

 Experiment from a little Tra& * 

 * Relating to the that yet lyes by me, 

 Magmifm of the and has been feen but 



Earth. ^ t WQ or t jj rec f r j eQc ] g5 



it may be added to the inftances al- 

 ready given about the produ&ion of 

 Magnetifm. For in that Experiment 

 I have (hewn, how having brought a 

 good piece of a certain kind of Eng- 

 lifh 0/^er 9 which yet perhaps was no 



fitter 



