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Rh contributors, to whom we owe so much, have been of great service in various ways. And it is needless to say that to the staff of the University Press, working under peculiar difficulties caused by the war, we owe much for constant and unfailing help.

A general historical sketch has been added as an Introduction. It is in no way meant, however, as an outline of the history or as a summary of the particular chapters, but only as a general view of the period in its special characteristics and in relation to the ages which follow. It will also be that notes, short and significant, have been added as before where necessary: they are possibly more numerous than in preceding volumes, and two or three genealogical tables have also been given.

J. P. W.

July, 1921.