A reprint of this book with minor corrections was issued in 1970. Now that a further printing is called for, I have taken the opportunity to incorporate some major revisions, in order to take account of further studies which have appeared or come to my notice since 1965, as well as any changes or developments in my own ideas. I have also added a number of references for the reader interested in following up some of the more crucial or controversial points. In the meantime there have also appeared my Vox Graeca (C.U.P., 1968; second edition 1974; third edition 1987) and Accent and Rhythm (C.U.P., 1973), to which there are several cross-references (abbreviated as VG and AR respectively).

In order to save expense and at the same time to avoid changes in pagination from the first edition, the new material has (as in the second edition of VG) been added as a supplement rather than worked into the main text (which contains only minor revisions). An obelus in the margin indicates the existence of a relevant supplementary note.

In addition I have now included a Select Bibliography and have appended a short account of the Latin (and English) names of the letters of the alphabet.