The prime result has been the development of an experimental procedure for producing a definite dielectric effect when water is added to an acetone solution of cellulose nitrate. This effect depends not only on the purity, dryness and concentration of the cellulose nitrate, but also on the average degree of polymerization. This last dependency is shown in Figure V, and its theoretical aspects will be discussed in the next section. The discontinuity at the precipitation region is a general effect, not depending on such extreme conditions. / M.S.