When lands have been so dedicated and posted as a state wild life sanctuary, the possession or carrying of firearms thereon, hunting or trapping thereon, or the killing or molestation of wild life on such lands by any person or by the owners or lessees thereof, or their agents, shall be unlawful during the period of such dedication: Provided, That the director of conservation may issue permits for the taking on any dedicated lands of predatory animals and birds and such other birds and animals as may require control or as may be appropriate in connection with experiments in wild life management or for other purposes not inconsistent with the original intent of the dedication.