TALK IS 'CORDIAL'; Vice President Plans to Head 'Constructive Opposition' Party TALK WITH NIXON HELD BY KENNEDY
Kennedy and Nixon conf, Key Biscayne; Kennedy seen seeking natl-unity Govt that would include liberal Repubs; they hold separate press confs on meeting; stress cordial and constructive nature of talk; Nixon offers to inform Eisenhower of substance; Kennedy says they did not discuss official role for Nixon; they agree to meet again; neither excludes role for Nixon in line with his duties which he describes as leader of constructive opposition; Nixon hails meeting as example of how US system works; illus