62 A Reply to Ml. John Mtoraij " on the Apparatus for 



minated the arrangement. The patches of tinfoil, and of 

 course the ends of the wires which terminated below and above 

 them, were separated from each other about two inches. When 

 the electric discharge was made by placing one of the balls of 

 the insulated discharging rod in contact with the further end 

 of the upper wire, &c. the under patch of tinfoil exhibited an 

 indent upward; and the upper patch an indent dov)nivard: tliey 

 were frequently perforated, and the burs similarly directed. 

 If I used two wi7-cs below, parallel to each other, say Jfths inch 

 apart, and one wire above, then had I two indents or two 

 burs directed upwards, and one indent or one bur downwards; 

 and on the other hand, when I employed two wires above and 

 one below, the phaenomena were reversed, there being tico bins 

 or indents from above, and one onlij from belorv. 



In this detail there is described another phaenomenon not 

 less interesting. I coated uniformly with China ink the ball 

 of the rod connected with the internal metallic surface of the 

 Leyden jar, as well as that of one of the balls of the jointed 

 discharger, and placed a vertical card between these balls. 

 When 1 made the discharge, the caid exhibited the usual ap- 

 pearance of a bur raised on both sides. But independently of 

 this, I Ibimd a ciradar portion of the China itik displaced J'rom 

 both of these balls, and an indent in each of them. Each ball 

 was an inch distant from the respective surfaces of the inter- 

 posed card, and the discharge was a powerful one. It was on 

 these that I founded the opinion that Mons. Moll's experi- 

 ment was only a modification of mine ; and I have transmitted 

 to Professor Moll of Utrecht a note of these experiments, 

 agreeably to his request to me. 



It is highly satisfactory for me to receive, after the lapse of 

 a few years, the verification of these experiments, sealed as it 

 were by the signet of celestial fire. 



I have the honour to be, sir. 



Your obliged and humble servant, 

 May 15, 1822. J. MuKRAY. 



XI. A Reply to Mr. John Murray, "on the Apparatus for 

 restoring the Action of the Lungs in apparent Death" By 

 Mr, John Moore, Jun. 



To Dr. Tilloch. 



Sir, — Is it not singular tliat Mr. Miu-ray should liave been 

 so tlispleased with me, for the notice I took of his machine for 

 producing artificial respiration, when he has given an invita- 

 tion to the public to completely investigate it ; re<jup«;ting them 



to 



