Various electrical properties have been derived from conductivity and electrical transport experiments for aqueous solutions of DNA. The specific conductivity shows a discontinuity when plotted against DNA concentration. Below this critical concentration the material transport number falls rapidly with decreasing concentration. The critical concentration corresponds to a similar discontinuity observed in the variation of O.D. with DNA concentration, measured at 2590 A. A possible explanation of this phenomenon involves the denaturation of DNA at concentrations below the critical concentration. Above this concentration zone native DNA predominates with a charge fraction of 0.4 while below this concentration denatured DNA exists with a very high charge, but lowered mobility.