Resembling water in physical properties, ethylene diamine is comparable to liquid ammonia as a polar solvent. The conductances and densities of concentrated solutions are linear functions of the concentrations and temperatures. Data are presented concerning: (1) density and its temperature coefficient for pure anhydrous ethylene diamine; (2) densities and conductances of sodium iodide, sodium bromide, sodium perchlorate, and potassium iodide solutions; (3) effects of water, toluene, ethyl amine, and cyclohexylamine on conductance; (4) change of conductance of concentrated potassium iodide solutions with temperature; (5) conductance of sulfur solutions ; (6) electrodeposition of active metals.