Mean contact differences of potential in volts; solids with liquids, and liquids with liquids — continued. 
ON THE CONTACT THEORY OF VOLTAIC ACTION. 
33 
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MDCCCLXXX. F 
# Depending on the carbon. 
The average temperature at the time these experiments were made was about 16° C. All the liquids and salts employed were chemically pure; the solids, however, were only 
commercially pure. The numbers in a vertical column below the name of a substance are the differences of potential, in volts, between that substance and the substance in 
the same horizontal row as the number, the tsvo substances being in contact. Thus lead is positive to distilled water, and the contact difference of potentials is 0T71 volt. 
