.70 Additional Notes. 



Secondly, If the north pole of a magnetic bar be approached near 

 to the eye of a sewing needle, the arctic ether of the magnet attracts 

 the antarctic ether, which resides in the needle towards the eye of it, 

 and repels the arctic ether, which resides in the needle towards the 

 point, precisely in the same manner as occurs in presenting an elec- 

 trised glass tube, or a rubbed stick of sealing wax to one extremity 

 of two skewers insulated horizontally on wine-glasses in the experi- 

 ment ascribed to Mr. Canton, and described in No. IX. ], of this 

 Additional Note, and also so exactly resembles the method of pro- 

 ducing a separation and consequent accumulation of the two electric 

 ethers by pressing a cushion on glass or on sealing wax, described in 

 No. 4 of this Note, that their analogy is evidently apparent. 



Thirdly, When much accumulated electricity is approached to one 

 end of a long glass tube by a charged prime conductor, there will 

 exist many divisions of the vitreous and resinous electricity alter- 

 nately; as the vitreous ether attracts the resinous ether from a cer- 

 tain distance on the surface of the glass tube, and repels the vitreous 

 ether; but, as this surface is a bad conductor, these reciprocal attrac- 

 tions and repulsions do not extend very far along it, but cease and 

 recur in various parts of it. Exactly similar to this, when a magnetic 

 bar is approximated to the end of a common bar of iron or steel, as 

 described in Mr. Cavallo's valuable Treatise on Magnetism; the 

 arctic ether of the north pole of the magnetic bar attracts the 

 antarctic ether of the bar of common iron towards the end in contact, 

 and repels the arctic ether; but, as iron and steel are as bad conductors 

 of magnetism, as glass is of electricity, this accumulation of arctic 

 ether extends but a little way, and then there exists an accumulation 

 of antarctic ether; and thus reciprocally in three or four divisions of 

 the bar, which now becomes magnetised, as the glass tube became 

 electrised. 



Another striking feature, which shows the sisterhood of.electricity 

 and magnetism, consists in the origin of both of them from the earth, 

 or common mass of matter. The eduction of electricity from the 

 earth is shown by an insulated cushion soon ceasing to supply either 

 the vitreous or resinous ether to the whirling globe of glass or of sul- 

 phur; the eduction of magnetism from the earth appears from the 



