Extension of the period for the denouncement of oil claims—Circular requiring payment of royalties in accordance with laws and decrees protested by the United States—Refusal of drilling permits except on compliance with protested regulations; orders to stop operations begun without permits—Offer of provisional permits on condition of an undertaking to comply with provisions of the law eventually to be passed—Denouncement by third persons of properties leased by Americans—Protests and representations of the United States