Studies on T H E Formation and Ionization of the Compounds of Casein

In this paper we shall attempt to show that the results of conductivity experiments with alkali caseinate solutions support the conclusions at which we arrived from transference experiments described in the previous paper. All the determinations which were made by us were carried out according to the well known Kohlrausch method. An oscillator with a tuning fork (one thousand vibrations per second) was used for the source of current, and the readings were made with the aid of a Leeds and Northrup slide-wire bridge and telephone. The platinum electrodes were coated with platinum black. The solutions which were used in these experiments were analyzed for casein and for alkali concentration as described in the previous paper. The water which was used had an average conductivity of 3 X 10 -6 mhos. A number of investigators have determined the conductivity of alkali caseinate solutions (Laqueur and Sackur (1), Robertson (2), and quite recently Pauli and Matula (3)). I t is interesting to compare the results of the different investigators, including those obtained by us. In Table I there are collected certain of the conductivity data at comparable concentrations. Although the results are all of the same order of magnitude they vary considerably among themselves. I t is also to be observed that the different series of our own