Dr. George E. Vincent, former President of the Rockefeller Foundation, lectured on "The Role of Humor" under the auspices of the Mark Twain Lectureship for the Advancement of Humor.  "Laughter," he said, "is the great symbol and expression of genuine liberty." Distinguishing among wit, satire, irony, cynicism and humor, Vincent called wit verbal juggling, irony "unsympathetic" as it pleased only insiders by making others appear ignorant, satire—shunned by Twain—"caustic ridicule" and cynicism a bitter form of defeatism.  Twain and Will Rogers, he said, exemplified humor, a typically American form which embodied a "sympathetic philosophy and expression of comradeship."     The Miscellany News