GEOGRAPHIC ADMINISTRATION BUILDINGS SIXTEENTH AND M STREETS NORTHWEST, WASHINGTON, D. C. GILBERT GROSVENOR, President FRED M. BERTHRONG, Assistant Treasurer HENRY WHITE, Vice-President O. P. AUSTIN, Secretary GEO. W. HUTCHISON, Associate Secretary EDWIN P. Grosvenor, General Counsel FREDERICK V. COVILLE, Chairman Committee on Research EXECUTIVE STAFF OF THE NATIONAL GEOGRAPHIC MAGAZINE GILBERT GROSVENOR, EDITOR WILLIAM J. SHOWALTER Assistant Editor CHARLES J. BELL FRANKLIN L. FISHER Chief of Illustrations Division J. R. HILDEBRAND, Chief of School Service President American Security and JOHN JOY EDSON Chairman of the Board, Washington Loan & Trust Company DAVID FAIRCHILD In charge of Agricultural Explorations, U. S. Department of Agriculture C. HART MERRIAM Member National Academy of O. P. AUSTIN Statistician GEORGE R. PUTNAM Commissioner U. S. Bureau of GEORGE SHIRAS, 3D E. LESTER JONES Director U. S. Coast and Geodetic Survey ORGANIZED FOR "THE INCREASE AND DIFFUSION OF GEOGRAPHIC All re TO carry out the purposes for which it was founded thirty-eight years ago, the National Geographic Society publishes this Magazine. ceipts are invested in the Magazine itself or expended directly to promote geographic knowledge. ARTICLES and photographs are desired. For material which the Magazine can use, generous remuneration is made. Contributions should be accompanied by an addressed return envelope and postage. IMMEDIATELY after the terrific eruption of the world's largest crater, Mt. Katmai, in Alaska, a National Geographic Society expedition was sent to make observations of this remarkable phenomenon. Four expeditions have followed and the extraordinary scientific data resulting given to the world. In this vicinity an eighth wonder of the world was discovered and explored-"The Valley of Ten Thousand Smokes," a vast area of steaming, spouting fissures. As a result of The Society's discoveries this area has been created a National Monument by proclamation of the President of the United States. AT an expense of over $50,000 The Society sent a notable series of expeditions into Peru to investigate the traces of the Inca race. Their KNOWLEDGE" discoveries form a large share of our knowledge of a civilization waning when Pizarro first set foot in Peru. THE Society also had the honor of subscribing a substantial sum to the expedition of Admiral Peary, who discovered the North Pole. NOT long ago The Society granted $25.000, and in addition $75,000 was given by individual members to the Government when the congressional appropriation for the purpose was insufficient, and the finest of the giant sequoia trees of California were thereby saved for the American people. THE Society is conducting extensive explorations and excavations in northwestern New Mexico, which was one of the most densely populated areas in North America before Columbus came, a region where prehistoric peoples lived in vast communal dwellings and whose customs, ceremonies, and name have been engulfed in an oblivion. TO further the important study of solar radiation in relation to long-range weather forecasting, The Society has appropriated $60,000 to enable Dr. Charles G. Abbot, of the Smithsonian Institution, to establish a station for four years on Mt. Brukkaros, in Southwest Africa. Copyright, 1926, by National Geographic Society, Washington, D. C., in the United States and Great Britain. All rights reserved. Entered at the Post Office at Washington, D. C., as Second-Class Mail Matter. Acceptance for mailing at special rate of postage provided for in Sec. 1103, Act of October 3, 1917, authorized July 1, 1918. "Positive Agitation" as accomplished in the new Hooveris beating -the time-tested requirement of thorough rug-cleaningreduced to an exact scientific process. Such beating, instead of being concentrated ina few violent strokes as with the carpetbeater or broom,is modified by The Hoover into a series of swiftly repeated air-cushioned taps. This is achieved by means of a totally new appliance-the exclusive and patented HooverAgitatorillustrated here. Suction lifts the rug from the floor and floatsit ona cushion of air while the Agitator gently flutters out all the embedded grit as the strong suction draws all the dirt into the dust-tight bag "Clean enough"-or C-L-E-A-N? Can there be a question of how clean a rug ought to be— particularly when that rug is your baby's play-place? Think . . tiny fists clutch the soft nap . rub sleepy eyes. . then, perhaps, furnish a solacing thumb to chew upon! Decidedly, here, "clean enough" must mean clean! The new Hoover, by reason of its revolutionary cleaning principle "Positive Agitation," The Hoover is also made in Canada, at Hamilton, Ontario The new HOOVER It BEATS... as it Sweeps as it Cleans PRESS OF JUDD & DETWEILER, INC. WASHINGTON, D. C. EVERY RCA has made radio not only greater-but simpler OVERY RCA Radiola shows this trend toward simplicity-combined always with new achievements in performance. Consider the eight tube super-heterodyne, In the RCA Radiolas of today, have shown the remarkable musical possibilities of radio when hooked up with the power of the lighting circuit. And practically every new feature of radio today was first developed by RCA engineers-or by their associates in the General Electric and Westinghouse laboratories. Radiola 28, eight tube super-het- RCA Loudspeaker 100 . $35 you see this sign. They have made the old type radio obsolete, and have brought a new conception of radio-and of music to thousands of homes. 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