The Medical Center Library maintains a small collection of medical instruments and other artifacts related to medicine and health care. The collection has items of historical significance to Duke as well. A neurosurgical stereotactic equipment exhibit is on level 3 and was donated by Dr. Blaine Nashold. In addition, there are two large collections of apothecary jars. The Caldwell collection includes porcelain and hand-blown glass jars from the 19th century collected while the Caldwells were in Ecuador. The Library also has on loan from the Mary D. B. T. Semans Foundation a beautiful collection of Italian and Hispano-Moresque albarelli (apothecary jars) and versatoi (ewers or pitchers) from the 15th to 18th century.