Any person making any contract of sale for future delivery of any cotton, grain, meats or other animal, mineral or vegetable product of which such person is, at the time of the making of such contract of sale for future delivery, the actual owner or as to which such person may be duly authorized by the owner thereof to make and enter into such contract of sale for future delivery may for his protection on such contract of sale for future delivery make and negotiate sales or purchases for future delivery upon any legally established board of trade or exchange in this or any other state and under the rules and regulations of such board of trade or exchange of a like and equal amount of cotton, grain, meats or other animal, mineral or vegetable products as that covered by and embraced in such contract of sale for future delivery of cotton, grain, meats or other animal, mineral or vegetable products so owned by him or which, at the time of the making of such contract of sale he was duly authorized by the owners thereof to enter into such contract to sell, for future delivery. And every such contract of sale or purchase so made upon any legally established board of trade or exchange in this or any other state shall be taken and adjudged by the courts of this State to be a good, valid and legitimate contract of sale or purchase, anything in the statutes of this State to the contrary notwithstanding; provided, that this section shall be deemed to authorize only bona fide hedges or contracts of purchase or sale for the purpose of fixing prices.