348 PHILOSOPHICAL TRANSACTIONS. [aNNO IJSft. 



;ind at the distance of 15 or 20 feet from the former. I then suspended one 

 end of a packthread to the middle of the first cat-gut, and carried it on so as 

 to lay it over the middle of the other cat-gut, and leave the other end of the 

 packthread hanging down about a foot below the cat-gut, with a loop to hang 

 several bodies to it, successively to receive the electricity excited by the tube 

 and applied to the other end of the packthread. 



All the bodies I tried received the electricity communicated from the rubbed 

 tube along the string, which appeared by holding a thread fastened to a stick, 

 the thread being attracted towards the suspended body. 



1. A gold medal. 2. A silver medal. 3. A copper medal. 4. A brass ball. 

 5. A steel ball. 6. A tin ball. 7. A leaden ball. 8. Sulphur, g. Sealing- 

 wax. 10. Pumice stone. 11. Bees-wax. 12. Resin. 13. Sal ammoniac. 

 14. Ivory. 15. Human bone. l6. Fish-skin. IJ. Loadstone. 18. P'lesh. 

 19. Cotton. 20. Wax-candle. 21. Tallow-candle. 22. A leek. 23. Celeri. 

 24. Tobacco-pipe. 25. A glass^ball. 26. A rush rolled up. 



Experiments relating to Query 2, — Retaining the first supporting string of 

 cat-gut, instead of the last cat-gut supporter, I made the packthread pass over 

 t-he following substances successively, all which transmitted the electricity to 

 the body suspended at the end of the packthread; viz. 1. A silk string, 

 2. Hair rope. 3. Parchment. 4. A thong of sheep-skin, but it stopped the 

 electricity till it was dry and warm. 5. A list of woollen cloth. 6. A list of 

 flannel. 7- Cadis, or a kind of worsted tape. 8. Quills. 9. Whalebone. 

 10. A man's thigh-bone. U. A bladder. 12. A cat, held between two. 

 13. A tallow-candle. 14. A wax-candle (the string was also laid over the 

 unburned cotton wick at the end of the candle). 15. A tallow-candle and its 

 wick. 16. Tobacco-pipe, with a cat-gut or a packthread through it, or with- 

 out, that is, a packthread string being fastened at each end of it. 1 7. A 

 sword-belt. 18. A piece of a white hat. 19. A piece of a black hat. 20. A 

 glass tube. 21. The same with water in it. 22. With spirit of wine. 23. The 

 same with mercury in it. 24. Sealing-wax. 25. Crape. 



All these substances, except the sheep-skin, the tobacco-pipe, the quills, the 

 candles, and the bone, not only transmitted the electricity, but became so far 

 electrical, as to attract the thread a little way on each side of the supported 

 packthread. More experiments are required to be made, before this query can 

 be turned into an assertion. 



Experiments relating to Query 3. — Instead of the last supporter of cat-gut, 

 near the suspended body, I made use of the following substances, stretched 

 from chair to chair : and then the thread hanging on the stick was not at all 



