You don’t have to be Irish to admire this breathtaking exhibition, come to America for the first time. Among the 70 treasures—some older than Saint Patrick himself—are Brian’s Harp (a 15th-century instrument that is one of Ireland’s national symbols), the silver-and-gold Ardagh Chalice (discovered a century ago in a Limerick potato field) and the lustrous Book of Kells, containing exquisite religious illustrations of the medieval period. This and other precious manuscripts are protected by a hermetically sealed module that duplicates the temperature and humidity of their natural habitat in Dublin’s Trinity College Library. The exhibit, sponsored by SCM Corp., remains in New York until Jan. 15. Then it will make four stops of one month each in San Francisco, Pittsburgh, Boston and Philadelphia.