partner over the Irish Free State Government Building. Interior: PLATE VI. PHOTOGRAPHS ILLUSTRATING THE VALUE OF AERIAL PHOTOGRAPHY IN ARCHAEOLOGICAL RESEARCH Fic. 1. Bath Internal Micrometer for rapidly verifying bores to .ooo1”. Fic. 2. British airship R.33 with D.H.53 light monoplane attached. Fic. 3. Bunte Bros. Factory, Chicago, Illinois, U. S. A. every year except 1920, Sweden. (12) U. S. A. Barnett. BIBLIOGRAPHY.—Marquess Curzon, Principles and Practice (1921), and Tke Colonial Office as Secretary of the