Four hundred miles of the most dangerous rapids in the United Statesthrough the Grand and Marble Canyons of the Coloradowill be traversed between Aug. 1 and Oct. 1 by a party of map makers and geologists sent out by the U. S. Geological Survey, under the direction of Col. C. H. Birdseye, a World War veteran, chief topographical engineer of the Survey. Their four boats are specially constructed with air chambers, and are manned by the most skillful boatmen of the region. The men are strapped in the cockpits, wearing life preservers continually....
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