Designed by Waddy B. Wood, architect, the new Department of the Interior building occupies two squares between C and E and Eighteenth and Nineteenth Streets. It is built of Indiana limestone and is the largest air-conditioned office building in the world. PUBLIC HEALTH SERVICE BUILDING This building, designed by J. H. deSibour, architect, is classical in design and built of white Georgia marble. It was completed in 1933. It is four stories in height and houses the large and growing office of the Surgeon General of the United States and his staff of assistants. In its location on Constitution Avenue it forms a part of the frame for the Lincoln Memorial. FEDERAL RESERVE BOARD BUILDING Completed in 1937, this building forms the center of the group of monumental marble buildings along Constitution Avenue west of Seventeenth Street. The design, by Paul P. Cret, architect, is based on classical motives. It is built of white Georgia marble. It is the headquarters building for the Federal Reserve Board. In it is a large mosaic map of the United States by Ezra Winter, mural painter, showing the location of the 12 Federal Reserve branch banks in the different sections of the country. NATIONAL ACADEMY OF SCIENCES This building, designed by Bertram G. Goodhue, architect, is immediately east of the Federal Reserve Board building. It is classical in design and built of white marble from Dover, N. Y. The building was dedicated by President Coolidge in April, 1924. The interior is decorated with paintings and decorations by Hildreth Meiere and Albert Herter; the sculptural decorations are by Lee Lawrie. AMERICAN INSTITUTE OF PHARMACY Immediately north of the Lincoln Memorial stands the American Institute of Pharmacy. It was designed by John Russell Pope, architect, and built of white Vermont marble. It is classical in its style of architecture, and in its location west of the National Academy of Sciences completes the group of buildings on Constitution Avenue that form a frame for the Lincoln Memorial. The building is the headquarters of the druggists in the United States. More than 14,000 druggists subscribed toward the building fund. The Pharmacopoeia of the United States, under which prescriptions and drugs are standardized, is supervised by the Institute. SCOTTISH RITE TEMPLE This building, at Sixteenth and P Streets NW., is the headquarters of the Supreme Council of the Thirty-third Degree, of the Ancient and Accepted Scottish Rite of Freemasonry of the Southern Jurisdiction. It is modeled after the tomb of Mausolus, at Halicarnassus, in Asia Minor, which was regarded by the ancients as one of the Seven Wonders of the World. Its 33 Ionic columns are 33 feet tall, suggesting the 33 degrees of Masonry. On each side of the main entrance is a colossal sphinx, symbolic of Divine Wisdom and Power, executed by A. A. Weinman, sculptor. The building was designed by John Russell Pope, architect. CARNEGIE INSTITUTION OF WASHINGTON