AbstractThe specific rotation of 15 monotonous oligopeptides of different repeating unit as well as of 6 other oligomer homologous series having asymetric C‐atom were studied as a function of the reciprocal molecular weight, based on literature data. From the results obtained it could be established which oligomers do not form secondary structure in the solvent investigated under the given experimental conditions. In such cases namely (α) is proportional to 1/M. For such oligomers the molar rotational increment of the different repeating units was given. In case of a secondary structure deviation from linearity occurs. In the cases investigated no general statement can be made.