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something in the mercury which can not be washed or filtered out. But 
is removed by mercurous sulphate. The mercury from cell (6) was taken 
out and placed in a tube and sparked by a large electric machine. Cad- 
mium lines were very distinct in the spectrum. Thus it would seem that 
polarization is caused by cadmium being deposited in the mereury and 
that the recovery is due to the removal of the cadmium by the mercurous 
sulphate. 
Indiana University, 
Bloomington, Ind. 
