Among Englishmen I have to thank Dr. Duncan Mackenzie for reading the portions of the work dealing with the megalithic monuments and with Sardinia in particular; Mr. A. J. B. Wace for reading those portions which relate to Thessaly and North Greece; Mr. Henry Balfour for numerous suggestions and improvements, especially in the earlier chapters. Professor J. L. Myres has been my kind adviser throughout, and much of the form of the work is entirely due to him.