Popular science monthly . up the enormous rich Coloradodelta in Arizona and Southern California,cutting out, through the countless ages,the huge gorge of the Grand Canyon, inmany ])laces a mile deep through therock. The photograph shows whathappens to the Colorado River clay,u|)e candistinguish. The Colorado delta is intensely aridin character, only a few clumps of saltbushes being able to subsist. Where ithas been irrigated the yields are enor-mous. The fertility of the soil is almostinexhaustible. The complete harnessingof the Colorado and the utilization of itstremendous flood-How constitut
Popular science monthly . up the enormous rich Coloradodelta in Arizona and Southern California,cutting out, through the countless ages,the huge gorge of the Grand Canyon, inmany ])laces a mile deep through therock. The photograph shows whathappens to the Colorado River clay,u|)e candistinguish. The Colorado delta is intensely aridin character, only a few clumps of saltbushes being able to subsist. Where ithas been irrigated the yields are enor-mous. The fertility of the soil is almostinexhaustible. The complete harnessingof the Colorado and the utilization of itstremendous flood-How constitute one ofthe realh- big reclamation engineeringproblems of the day. Fighting the Sand-Peril. At left, the sand encroachingupon valuable fruit-growing land,stifling it to death. It travelswith an utter disregard of allbarriers thrown against it by man Below, boards erected to shiftthe sand and prevent the railroadtracks from being covered. Thesebarriers do not last long undersuch ruthless and persistent wear T O make a successful tightagainst the ever-moving sand dunes of the Columbia Riverregion and at other places alongthe Pacific Coast, the UnitedStates must follow the plan adoptedby France many years ago. Itmust build one great dune in aneffort to eliminate many smallerones. This is the verdict of ForestService experts who have made aworld-wide study of sand dunesand methods employed to combat theSince the planting of forests has beenfound to be the most effective means ofchecking the encroachments of sand theproblem is one that comes within thejurisdiction of the United States ForestService. In the lower Columbia River valley,l)oth in Washington and Oregon, sand(huus are
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
