“ Did the orders of the Commission, purportedly issued pursuant to Section 6 (b) of the FTC Act [15 U.S.C.A. § 46 (b) ] , constitute a requirement that petitioner furnish 'answers in writing to specific questions', and not a requirement of a 'special report', so that the provisions of the third unnumbered paragraph of Section 10 of the FTC Act [15 U.S.C.A. § 50] , providing for forfeitures in the sum of $100 per day for each day of failure to file a 'report', have no application? ”