Subject to the provisions contained in the Imperial Act of the 18th and 19th Victoria chapter 54 and of an Act of the 18th and 19th years of Her Majesty entitled An Act to repeal the Acts of Parliament now in force respecting the Disposal of the Waste Lands of the Crown in Her Majesty’s Australian Colonies and to make other provisions in lieu thereof which concern the maintenance of existing contracts it shall be lawful for the legislature of this State to make laws for regulating the sale letting disposal and occupation of the waste lands of the Crown within the said State.