Cardboard canister that is still sealed and contains Puretest flaxseed meal from the 1930's. Sold in Rexall drugstores, there are instructions on the back for making a poultice, which would have been applied to an irritated or aching part of the body. Would not recommend using it for anything but decor due to its age.
This antique container would be perfect for your farmhouse decor. It also makes a great gift for a pharmacist or vintage advertising collector. It would look awesome grouped with other antique medical supplies.