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The reason why certain varieties perform more satisfactorily than others is of great importance to the plant breeder. Such information furnishes the basis for a logical plan for the improveme~t of the crop. At present it is not possible by plant physiological methods alone to obtain all necessary infonnation regarding the reasons for differential responses of various important varieties. By growing the varieties in .a field trial, however, it is possible to obtain comparable data on such characters as yielding ability, time of maturity, reaction to prevalent diseases, and certain morphological characters. By biometrical methods the data can be analyzed for the purpose of learning the relative importance of various characters in their influence on yielding ability.A series of rod-row trials were made at the Waseca branch station in 1926. Conditions were so favorable for the study that it was planned to determine, by means of correlation coefficients, the 1 The studies of disease resistance are a phase of the cooperative studies conducted by the sections of plant breeding and plant pathology, Minnesota Agricultural Experiment Station, St. Paul, Minn. The breeding of spring and winter wheat is