1. The conductivities of aqueous solutions of glycine, d,l-valine, and l-asparagine have been determined, and comparisons have been made with similar data reported in the literature.
2. On the basis of certain theoretical considerations, calculations of the expected conductivities of aqueous solutions of glycine, asparagine, aspartic acid, and glutamic acid have been made and these data have been compared with similar data obtained experimentally.
3. The dissociation constants of the carboxyl groups of aspartic acid and glutamic acid have been calculated from conductivity data.
4. It is shown that alanine has no effect on the ionic atmosphere of solutions of potassium chloride.