[Illustration: Hoover (Boulder) Dam and Lake Mead provide a fine recreational area along the Arizona-Nevada border. _Photo by Herb McLoughlin._] [Illustration: Grand Canyon National Park. The Grand Canyon of the mighty Colorado River defies efforts to describe it adequately. _Photo by A. C. Jackson._] [Illustration: Wupatki ruins in Wupatki National Monument, one of the most spectacular pueblos in Northern Arizona. _Photo by George K. Geyer._] [Illustration: Walnut Canyon. In the walls of this canyon, near Flagstaff, under overhanging ledges are a series of prehistoric Indian ruins. _National Park Service Photo._] [Illustration: Montezuma Castle, overlooking Beaver Creek in the Verde Valley, is one of the most beautiful cliff dwellings to be found in this country. _Photo by Ray Manly._] Transcriber’s Notes —Retained publication information from the printed edition: this eBook is public-domain in the country of publication. —Silently corrected a few palpable typos. —In the text versions only, text in italics is delimited by _underscores_. End of the Project Gutenberg EBook of Agatized Rainbows, by Harold J. Brodrick