From and after the passage of this act, it shall be lawful for the county commissioners of any county to appropriate moneys toward the maintenance of any organization or society incorporated under the laws of this Commonwealth for the prevention of cruelty to animals and which, for a period of at least two years prior to the making of such appropriation, shall have been engaged in carrying out the purposes of its incorporation in whole or in part within said county.
16 P.S. § 7928