Charles Waldstein's "Essays on the Art of Pheidias," New York, 1885, is an exceedingly valuable and suggestive volume.

Two small books, written in a somewhat popular vein, make very pleasant reading for those pursuing these studies: "Studies in Greek Art," by J. E. Harrison, London, 1885, and "Greek Art on Greek Soil," by J. M. Hoppin, Boston, 1897.

Besides the works devoted exclusively to the subject of Greek sculpture, the subject receives due attention in various general histories of art, of which may be mentioned, Lucy Mitchell's "History of Ancient Sculpture," Lübke's "History of Sculpture," and Von Reber's "History of Ancient Art."

A valuable bibliography is given in Gardner's "Handbook."

III. HISTORICAL DIRECTORY OF THE MARBLES REPRODUCED IN THIS COLLECTION.

[Frontispiece.] Terminal bust of Pericles, after an original by Cresilas. Approximate date, 440-430 B. C. In the British Museum, London.

1. [Bust of Zeus Otricoli]. Considered by Brunn and others a copy from a head of the statue by Phidias. Later critics do not agree with this opinion, and Furtwängler calls the head a Praxitelean development of the type of Zeus created in the time of Myron. Now in the Vatican Gallery, Rome.

2. [Athena Giustiniana (Minerva Medica)]. Considered by Furtwängler a copy, after Euphranor, of a statue dedicated below the Capitol, called Minerva Catuliana, set up by A. Lutatius Catulus. The ægis and sphinx are copyist's additions. Found in the gardens of the convent of S. Maria sopra Minerva, Rome. Both arms are restored. Now in the Vatican Gallery, Rome.

3. [Horsemen from the Parthenon Frieze.] The frieze of the Parthenon is part of the decorative scheme of the marble temple of Athena, built during the age of Pericles (480-430 B. C.) on the Acropolis, Athens, and decorated under the direction of Phidias. The frieze consisted of a series of panels or slabs, about 3 ft. 4 in. in height, and was set on the outer wall of the cella. Being lighted from below, the lower portion is cut in low relief (1¼ in.) and the upper parts in high relief (2¼ in.). The panel of the Horsemen is one of the Elgin Marbles, removed by Lord Elgin from the Parthenon in 1801-1802, and now in the British Museum, London.

4. [Bust of Hera.] Considered by Murray a copy after Polyclitus. Regarded by Furtwängler as a "Roman creation based on a Praxitelean model." Catalogued in Hare's "Walks in Rome" as a probable copy after Alcamenes. In the Ludovisi Villa, Rome.