The qualitative work with the voltameter began early in July of 1909, following the quantitative experiments recorded in Part and continued until the middle of the following December. During this time only five quantitative experiments were made and these have been included with the earlier measurements. The qualitative experiments consisted in making silver deposits under varying conditions in small voltameters, which could be easily examined under the microscope or photographed. In addi tion to these we made some deposits in the field of a microscope and investigated the potential relations between anode and cathode. Afte'r resuming the quantitative work we still made a few qualitative tests from time to time and have included them here. In Section II of this paper some further qualitative work will be described in connection with the chemistry of the filter paper voltameter.

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