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Jan H. Oort's work.- Meritus Emeritus.- Jan Hendrik Oort and Dutch astronomy.- Oort's scientific importance on a world-wide scale.- Oort and international co-operation in astronomy.- Reminiscences of the early nineteen-twenties.- The first five years of Jan Oort at Leiden, 1924-1929.- Early galactic structure.- Early galactic radio astronomy at Kootwijk.- Oort and his large radiotelescope.- Ten years of discovery with Oort's Synthesis Radio Telescope.- Oort's work on comets.- The evolution of ideas on the Crab Nebula.- Oort's work reflected in current studies of galactic CO.- On high-energy astrophysics.- Oort and extragalactic astronomy.- Birthday wishes.- The Earth and the Universe.- The challenge of Jan Oort.- Jan Oort at the telescope.- Personal recollections.- Style of research.- Manuscript.- Bibliography of Jan Hendrik Oort 1922-1979.- Subject Index to Oort's Bibliography.- General Subject Index.- Name Index.