M. Viard on the Electro-chemical Deportment of Oxygen. 255 

 Table {continued). 



The results contained in the foregoing table clearly indicate 

 that the presence of oxygen upon the negative plate augments 

 the current, and that its presence upon the positive plate dimi- 

 nishes the same. 



For example, let us consider the currents produced by copper 

 and silver in water. The first column shows us that in boiled 

 water the deviation was about 3°*5, that it was increased to 13° 

 when the oxygen was on the side of the silver plate, and that it 

 was reduced to o, 5 when the oxygen was on the side of the 

 copper plate. 



The second column shows that the deviation, which in aerated 

 water amounted to 10°, decreased to o, 5 when the silver plate 

 was immersed in boiled water, but that it increased 1° when the 

 copper plate was withdrawn from the influence of oxygen. 



All other results in the same table may be interpreted in a 

 similar manner. 



The following table shows the whole series of experiments 

 which were made by varying the plates and the electrolytes. 

 The results accorded perfectly with the above : — 



