Neiv Outlines of Chemical Vhihsophy, 427 



tricity of A was equally divided between A and B, which be- 

 came known by measuring them with an electrometer. 



Exp. 4. .The gilt surface of the insulating stand A being 

 electrified by induction, as before, and heid o.ver the brass ball 

 No. 4 communicating with the earth, the slip of gold-leaf upon 

 it stood erect, pointing to that on A, and strongly attracting each 

 other : hence I concluded, tliat the two surfaces were in con- 

 trary electrical states. To demonstrate the truth of this sup- 

 position, I excited a stick of sealing-wax by rubbing it with a 

 woollen cloth, and held it at a proper distance from the two slips 

 of metal : that upon the gilt surface was attracted by it, but the 

 other was repelled. 



As a further proof of this test, I held one of my electrometers, 

 so that the wire upon the top of it came into contact with the 

 slip of metal uj)on the brass ball. The leaves of the electro- 

 meter received photogen (minus electricity) and diverged to an 

 angle of 40 degrees. The electrometer being discharged, and 

 applied a second time to the slip of metal upon the brass ball, 

 the leaves of the electrometer diverged Avith the same element 

 as before : thus, by continuing the operation, electricity may be 

 drawn from the same object as long as the gilt surface of the 

 insulating stand contains power to attract it from the earth. 

 When the gilt surface of the insulating stand is charged with 

 thermogen, it attracts photogen from the earth ; but when the 

 gilt surface is charged with photogen, thermogen is drawn from 

 it. These experiments are delicate, and will not succeed in all 

 states of the earth, unless the electrometer be a very good one. 

 But this is a su!)ject which remains for further investigation. 



The attraction ])etween the two elements was so strong, that 

 when the slip of metal upon tha brass ball was bent out of its 

 perpendicular direction, by the wire of the electrometer, it in- 

 stantly returned into its former position, as soon as it was set at 

 liberty, like an elastic fibre. 



This element certaiidy came from the earth ; for, when an in- 

 sulated glass ball was ysed in the same manner as the brass one, 

 the slip of metal upon the glass soon became electrified, but in 

 the same slate as that above it ; for, all communication being 

 cut off between the earth and the glass ball, it could not receive 

 electricity from any other object. 



Whence it is evident, that when the inside of a Leyden jar is 

 receiving thermogen from the electric machine, this element at- 

 tracts photogen to the outside from the earth, and it is ouly the 

 coating that prevents their union ; for, take away the coating, 

 and the jar will no longer contain those elements, because they 

 pass through glass like light or magnetism. — This property of 

 elcetricity admits of an experimental demonstration. 



This 



