(1) Mercury oxide (both red and yellow) can be used into the electrode plate of the alkaline accumulator in the pasted form by mixing silver oxide. (2) Its discharge characteristic curve varies in two stages, the first stage being caused by the discharge of silver oxide and the terminal voltage of about 0.95 volt, and the second stage being caused by mercury oxide. (3) Mercury oxide seems to be a considerably poor substance in the electrical conductivity and the mixing of silver oxide raises its electrical conductivity.
(1) The polarographic method was tested and found to be satisfactory for the determination of zinc in natural waters. (2) The zinc content of a number of hot springs of Japan was polarographically estimated. (3) The amount of zinc in sea water is considered to be less than 10 γ per litre.
The molecular compound of naphthalene. and naphthols with mono-, di-, tri-, and tetra-nitro aromatic compounds are systematically compared, and the compound formation discussed with solid—liquid phase diagrams.