( 103 ) 
TABLE VII. 
10% amalgam—38.827 0 amalgam., 
Time 
E. M. F. in Volts. 
TABLE VIII. 
J0% amalgam—60% amalgam. 
i Volts 
Cell XIV 
13.5 
23.5 
29.0 
30.5 
31.25 
37.25 
47.75 
0.0008 
0.0009 
The previous measurements of Ernst Cohen have taught us that 
at 0° the potential difference between pure (dendritic) zinc and the 
10% amalgam amounts to 0.000488 volts, the zinc forming the 
negative pole. From the above measurements we may conclude that 
in the cases where a potential difference between zinc and zinc 
amalgams does exist, this is always of such a nature that the zinc 
forms the negative pole. 
All the objections arising from the fact that previous observations 
have been made with materials insufficiently electrically defined are 
thus removed and the “explanations” given for the occurrence of 
polar exchange also no longer count. 
