1889. Contents: Thales; Pythagoras and His School; The Geometers of the Fifth Century B.C.-Hippocrates of Chios: Democritus; Archytas; Eudoxus; The Successors of Eudoxus-I. Menaechmus; The Successors of Eudoxus-II. Deinostratus; The Successors of Eudoxus-III. Aristaeus; and Theaetetus.