All contracts of sale for future delivery of cotton, grain, stocks, or other commodities, (1) made in accordance with the rules of any board of trade, exchange, or similar institution, and (2) actually executed on the floor of such board of trade, exchange, or similar institution, and performed or discharged according to the rules thereof, and (3) when such contracts of sale are placed with or through a regular member in good standing of a cotton exchange, grain exchange, board of trade, or similar institution, organized under the laws of the State of Texas or any other State, shall be and they hereby are declared to be valid and enforceable in the courts of this State, according to their terms; provided, that contracts of sale for future delivery of cotton in order to be valid and enforceable as provided herein, must not only conform to the requirements of clauses 1 and 2 of this section, but must also be made subject to the provisions of the United States Cotton Futures Act, approved August 11, 1916, and any amendments thereto; provided, further, that if this clause should for any reason be held inoperative, then contracts for the future delivery of cotton shall be valid and enforceable if they conform to the requirements of clauses 1 and 2 of this section; provided further, that all contracts as defined in Section 1 hereof where it is not contemplated by the parties thereto that there shall be an actual delivery of the commodities sold or bought shall be unlawful.