Galviinic Society of Paris. 6 1 



Fifty crammes of this solution were poured into a glass tube 

 closed at one end, washed in distilled water, and of 10 mil- 

 limetres of inierior diameter, and 144 millimetres long ; in 

 a second tube, longer by about 16 millimetres, nearly 50 

 grammes of pure distilled water. The first tube was placed 

 upon a kind of chandelier of tin, in such a manner as to be 

 upon a lt%el with the second ; and both of them were fixed 

 with wax, the one near the other, upon a glass plate placed 

 up')n a large porcelain one. The conuDunication was esta- 

 blished between them by means of a syphon, the branches of 

 which entered 27 millimetres into the tubes. In order to pre- 

 vent the fingers from touching the water of the apparatus, by 

 means of a g,lass rod carefully washed, they held upon one of 

 the orifices of the syphon filled with water, a damper of paper, 

 which thev withdrew, by means of the same glass rod, at the 

 moment when the branches of the syphon entered into the 

 water of the tubes. l\vo gold wires, proved by M . Darcet, and 

 of the diameter of about half a millimetre, had been inserted 

 to a deoth of about 65 millimetres, or thereabouts, into the 

 two tubes, which were exactly filled. This apparatus was 

 covered by a bell glass resting upon the large porcelain 

 nftile, and the gold wires were beat so as to come out from 

 below the bell glass. 



There were afterwards brought to the tai)le upon which 

 the apparatus stood, three piles, placed in communication, 

 composed of zinc and copper, with interposed pieces of 

 cloth saturated with a solution of muriate of ammonia. Two 

 of these piles were formed, each of 30 pairs, G7 miUimetrea 

 in diameter ; the third consisted of 40 pairs of square plates, 

 of 51 millimetres of surface. These piles had been mounted 

 ill a scparare chamljer, in order to prevent all inf.ueuce of 

 their atmosphere upon the n^uids of the apparatus. 



Tbc gold wire on the side of the solution of the nmrlatc 

 of soda was placed in contact with the ncguiive jiole, and 

 that of the pure distilled water with the positive pole. Hy- 

 drogen "as was immediately evolved in great abundance in 

 the solution of muriate of soda. The oxygen gas was ex- 

 tricated less briskly in the tube containing pure water, but 

 nevertheless with more promptitude and abimdaiicc than if 



i; 



