For the estimation of starch in wheat and certain wheat products, an adaptation of the polarimetric method of Mannich and Lenz has been developed. It gives satisfactory results with wheat, wheat flour and wheat starch and with mixtures of known composition. Proof is given that the method is accurate in the presence of proteins, sugars and hemicelluloses. It avoids the errors inherent in hydrolytic methods and is believed to be more convenient than Rask's procedure.