Administrative and operating expenses: For operating and administrative expenses under the Federal Crop Insurance Act, approved February 16, 1938, as amended (7 U. S. C. 1501-1518; 55 Stat. 255-256), $3,500,000, including the employment of persons and means in the District of Columbia and elsewhere, printing and binding, purchase of lawbooks, books of reference, periodicals, and newspapers: Provided, That no part of this appropriation shall be used for or in connection with the insurance of wheat and cotton crops planted subsequent to July 31, 1943, or for any other purpose except in connection with the liquidation of insurance contracts on the wheat and cotton crops planted prior to July 31, 1943.