Mass. Gen. Laws ch. 94, § 58: Serving oleomargarine at hotels, restaurants, etc.; notice; penalty

Section 58. Whoever furnishes oleomargarine or causes it to be furnished, instead of butter, in any hotel, restaurant or boarding house or at any lunch counter, to a guest or patron thereof, without notifying said guest or patron by means of signs or printed notices on menus, such printing to be of not less than twenty-four point type, in the English language, that the substance so furnished is not butter shall be punished by a fine of not less than ten nor more than fifty dollars.