It was remarked by the late eminent engineer, Mr. Milne, that in his tour through the classical regions of Europe, he derived more professional benefit from an examination of the construction of ancient masonry than from any other subject that engaged his attention. Although it is not to be expected that the Antiquary will regard this subject with equal interest, yet I think a little experience will convince him that a careful consideration of the technical construction of ancient buildings is not wholly devoid either of utility or interest, and may render him important assistance in determining their date. In confirmation of this I need only point to the admirable essay of one of our most distinguished members, Mr. Hamilton, on the Ancient Fortresses of Greece, in the fifteenth volume of Archæologia; an essay which I have always regarded as a model of antiquarian inquiry, and one not surpassed in point of interest and value by any of our published Transactions.