68. Whoever contravenes the provisions of sections 17, 18, 21, 23, 27 to 30, 34, 35, 36, 39, 40, 42, 45, 46, 48, 59 or 66 of this act is guilty of an offence and liable, in addition to the payment of the costs, for a first offence to a fine of $25 to $100 and for any subsequent offence within two years to a fine of $100 to $200.