Section 6
SEC. 6. Vessels belonging to the Bureau of Coast Guard and Transportation, running on regular schedules, shall be paid by the Bureau of Posts for mail service furnished by said vessels at a rate based upon the rate charged by commercial vessels under contract, the exact amount of the compensation to be determined by the Secretary of Commerce and Police; but the Bureau of Posts may, in part or full payment thereof, maintain on board the Coast Guard vessel or vessels a postal clerk or clerks for the joint service of the two Bureaus.