WEEKL CALENDAR

CAMBRIDGE

GROPPER ART GALLERIES (in the lower lobby of the Brattle Theatre): "Art Nouveau," a collection of original lithograph posters by leading artists of this style. Starts Monday.

BUSCH-REISINGER MUSEUM: "Artists of the Bauhaus: Painting Sculpture, Industrial Design" and "German Art, 1900-1960," two extensive collections.

PAUL SCHUSTER ART GALLERY: An exhibit of engravings and etchings of the fifteenth through nineteenth centuries, from a private collections. Through Oct. 14 at 134 Mt. Auburn St.

BOSTON

MUSEUM OF FINE ARTS: "25 Centuries of Peruvian Art, 700 B.C. to 1800 A.D." Co-sponsored by the Peabody Museum, this exhibition contains over 300 objects, including a grouping of pre-Columbian gold.