HONORED DOCTOR—Members of a harp quintet are giving undivided attention to Dr. Maurice J. Lewi, 98, at the Sesquicentennial Dinner of the Medical Society of the County of New York at the Hotel Plaza in Manhattan. Dr. Lewi is the oldest practicing physician in the U. S. Carol Baum, left to'right, Marjo Preusing. Kathleen Naden, Marian Harding, and Diane Williams are doing the musical honors for him.