Etruscan.-Its salient feature was the semicircular arch, its most flourishing period B.C. 753; the Romans borrowed and absorbed it, thus forming the Early Roman.

Egyptian. An imitation, originally in stone, of timber construction. Its salient features are the column and straight lintol.

Acknowledgments.

My acknowledgments are due for kind permission to use most of the foregoing Illustrations

To the Proprietors of the Graphic for Nos. 4, 5, 6, 7.

To the Daily Graphic for Nos. 8, 25.

To Black and White for Nos. 18, 23.

To Messrs. Macmillan & Co.'s English Illustrated Magazine
for Nos. 10, 11, 12, 20.

To the Council of the Royal Institute of British
Architects for Nos. 29, 30.

To Messrs. Cassell & Co. for No. 24.

To Mr. Freeman Dovaston for Nos. 17, 28.
To the Builder for Nos. 13, 16.

To Messrs. Winkley & Son for No. 31.

W. T.