62 Experiment made lij the 



the other tube haJ aho contained distilled water only. This 

 extrication of gas continued in a sensible manner for sixty 

 hours, at which time tVnee pilr;s, completely similar to the 

 first, were substituted in place of them. The energy of these 

 new piles seemed to be extinguished in 18 hours; but they 

 revived and were manifested for IS hours more. The ap- 

 paratus was therefore submitted to the Galvanic action during 

 96 hours in all. 



The following effects were perceived in this interval. The 

 surface of the solution of muriate of soda became frothy. 

 A kind of whitish pellicle covered, in a ^xeat measure, the 

 inner sides of the tube, and gradually trickled down to the 

 junction of the glass and its supporter or stalk of tin. The 

 solution became slightly turbid. 



In the pure distilled water the effects were more remarka- 

 ble. After some hours of Galvanic action the surface of the 

 water assumed a feeble shade of greenish yellow. This co- 

 lour gradually spread to the lower parts. The gold wire in- 

 serted into it seemed to be attacked. 



The piles were dismounted, and the apparatus remained 

 viiuler the the bell glass eight davs longer; during this time 

 the pure distilled water had entirely changed its state. The 

 intensity of the greenish yellow was increased. This colour 

 extended into the corresponding branch of the syphon, into 

 its bend, and even into a part of the second branch. The 

 gold wire inserted in this side was so much dissolved as 

 to be perceptible by the naked eye; and two days after 

 the action of the pile had ceased, the part of this wire that 

 had been inserted, being about 63 millimetres long, had to- 

 tally disappeareri. 



The tube tontaming the solution of muriate of soda re- 

 mained in the slate already described ; only the semi-opakt 

 pcliicle of the sides was raised into the lower part of the cor^ 

 respondent branch of the syphon. 



In this state the bell glass and the syphon having been 

 taken away, a strong smell of oxynmriatic acid was mani- 

 fested in the bell glass, the syphon, and, above all, in the 

 distilled water. Son)e drops of thi?: water discoloured the 

 linclurc of turnsole. Tded with the solution of muriate af 



silver. 



