of the Ley den Jar. 403 



nutsidie, and these were immediately atlracled by it. On with- 

 drawing the wax, its elcL-trical state was ascertained by presenting 

 it to the electrometers as before, and found to be positive. 



Exp. 4. The preceding experiment was repeated with this 

 difference onlv, that after the wax had repelled the balls con- 

 nected with the inner surface, it was brought, instead of once, 

 two or three times in succession, tosvards those connected with 

 the outer; and the attraction between the wax and the balls de- 

 creased every time the wax was presented to them till it dis- 

 appeared ; and then, on brii:a,ing the wax somewhat nearer, re- 

 pulsion took place between it and the balls. While the wax 

 attracted the balls connected with the outer surface, the electri- 

 cal state of the wax, on cxaoiina'tion, always proved to be posi- 

 tive; and when it repelled them, its state was always found to 

 be ncgotive. 



Exp. 5. The glass tube was next excited and presented to 

 the balls communicating with the inner surface, and they were 

 repelled by the tube ; and continued to be so in whatever man- 

 ner it was presented to them, and at every distance at which it 

 could influence them. 



Exp. G. The second stick of sealing-wax being strongly ex- 

 cited, was brought towards the balls connected with the outer 

 surface of the jar, aiid they were vigorously repeilei by the 

 wax ; and continued to be so in whatever manner it was pre- 

 sented to them, and at every distance at which it could influence 

 them. 



Erp. 7. The glass tube was excited strongly and brought 

 rapidly towards the same balls, and they were instantly attracted 

 by it ;'the tube was withdrawn, and again brought tov/ards theui 

 as before ; they were again attracted, but not quite so strongly 

 as in the first instance. 



Exp. 8. The tube was well excited again, and brought slowly 

 towards the balls : at first they were slightly attracted ; but 

 when it was advanced, they were slightly repelled ; and when it 

 was brought still nearer, the balls kept briskly receding from the 

 tube. The tube beiiig withdrawn, was presented to each of the 

 electrometers in succession, and its effects on them proved it to 

 be in a negative state of electricity. 



Exp. 9^ The negative electrical state of the tube being de- 

 stroyed, it was again excited positively, and presented suddenly/ 

 two or three times in succession to the balls connected with the 

 outer surface ; the attraction between the tube and balls was 

 diminished every time the tube was presented to them, till it dis- 

 appeared ; and then, on bringing the tube something nearer, 

 repuliion took place between it and the balls. The tube, after 



C c 2 repelling 



