The introduction of a crop involves the question of quality as well as the environmental conditions under which profitable production may be undertaken. Varieties enter into the quality of the crop. In order to solve this problem in the case of flax, a comparative study of the available samples of seed was made, following the routine methods for "oil seeds." Samples were obtained from four states besides Oklahoma where flax is grown for the seed. Experienced seedsmen or experiment station workers labeled the varieties, and we assume that they are true to name. The object of our work has been to determine which variety is most desirable from the standpoint of oil and protein production and to determine if there is a climatic limitation for flax seed production. The Wintons (1) quote Haselhoff, showing that flax obtained from widely separated areas has a fairly uniform composition. The differences might have been due to varieties or soil conditions.