VOL. XLI.] PHILOSOPHICAL TRAWSACTIONS. 349 



attracted by tlie suspended ivory ball, which I made use of in all the experi- 

 ments to try the supporters, 



1. A hempen rope. '2. A small packthread. 3. A drawn sword. 4. A 

 sword in the scabbard, 5. The scabbard without the sword. 6. A twisted 

 cotton thread. 7. I'ape made of thread. 8. Bars, tubes and wires of copper, 

 brass, iron and lead. g. White paper and brown. 10. A moist thong of 

 sheep-skin. 11. Celeri. 12. Leeks. 13. Fir-wood. 14. A cane. 15. A 

 piece of black thorn. 1 6. The same rushes that had before received the elec- 

 tricity when suspended. 17. A sponge dry. 18. White thread, ip. Hay. 

 20. A marble slab. 



Such bodies as were too short to reach from chair to chair, were lengthened 

 out by pieces of packthread at each end. 



Experiments relating to Query 4. — The cat-gut supporters, and all the others 

 mentioned in the experiments to Query 3, which transmitted the electricity, 

 attracted the thread of the stick near the conducting packthread, but not so 

 far as the chairs to which the said supporters were fastened. 



Experiments relating to Query 5. — All the supporters which did not transmit 

 the electricity, when they reached from chair to chair, were made to transmit, 

 when they were lengthened out with cat-gut at each end, and then they be- 

 came electrical themselves from one end to the other, as becoming part of the 

 suspended body ; and becoming so saturated, as not to be able to carry the 

 electricity on either side any farther than the cat-gut to which they were fas- 

 tened. 



Experiments relating to Query 6. — ^The late Mr. Stephen Gray has, by rub- 

 bing, excited electricity in several of those bodies, which I have made sup- 

 porters of, to transmit the electricity. See Philos. Trans. N° 366. I have 

 done the same with several others, but not with all of them, though I shall 

 try them all : but as it is more difficult to excite that virtue in some than 

 others ; and all the experiments in general succeed better in dry and cold 

 weather, than in moist and warm, I must wait for proper opportunities to make 

 the experiments, and then I shall communicate them. 



Experiments concerning mixed Substances. — I . Cadis, or woollen tape, laid on 

 thread-tape, when made a..supporter, transmitted the electricity. 2. When the 

 thread-tape was uppermost, the electricity was stopped. 3. When they were 

 twisted together, the electricity was transmitted, but most weakly when the 

 packthread going to the ball was laid over that part of the twist which had the 

 thread-tape. 



The two paper supporters, which did not transmit the electricity, ought to 

 have done it according to Query 2; because, by Mr. Gray's experiments, elec« 



