These are appeals by three persons each of whom was convicted of an offence under s. 11 (3) of the Marketing of Primary Products Act 1927-1940 N.S.W.. This sub-section provides that "Every producer who except in the course of trade or commerce between the States or save as exempted by or under this Act, sells, disposes of or delivers any of the commodity in respect of which a board has, before or after the commencement of the Marketing of Primary Products (Amendment) Act, 1934, been appointed, to a person other than the board, and every person other than the board who, except or save as aforesaid, buys, accepts or receives any of such commodity from a producer, shall be guilty of an offence and liable on summary conviction to a penalty not exceeding one hundred pounds". The first appellant, Brazell, is a producer of potatoes and he was convicted of disposing of a commodity, that is potatoes, in respect of which a board had been appointed to a person other than the board, which had not previously been tendered to and refused by the board, and had not been exempted by or under the Act and were not the subject of trade or commerce between the States. The other two appellants, Garlick and Coy, were convicted of receiving this commodity from Brazell. The prosecutions were launched in respect of a transaction which occurred on 10th June 1950. It was proved that on that date potatoes were a commodity in respect of which a board had been appointed, namely the Potato Marketing Board. It was also proved that proclamations had been made under s. 5 (8) of the Act vesting in that board all potatoes other than those excepted by the proviso to that sub-section. The text of the proviso is as follows "Provided always (and without detracting from the generality of sections three and 3a of this Act) that such proclamation under this sub-section shall not affect any portion of such commodity as is the subject of trade or commerce between the States or as is required by the producers thereof for the purposes of trade or commerce between the States or intended by the producers thereof to be used for such trade or commerce".