Shipping. Recording of mortgages on vessels and subordinating maritime liens upon vessels for necessaries to liens of mortgages, hearings on H. R. 8873 (revised H. R. 8422), for recording of mortgages of vessels and notation thereof on certificates of registry or enrollment and license, creating jurisdiction in District Courts of United. States for foreclosure of such mortgages, and providing procedure in connection therewith, also for maritime liens upon vessels for necessaries, and so forth, and their enforcement, and subordinating same to liens of mortgages, repealing all conflicting acts, and for other purposes, Sept. 4 and 5, 1919.