The Arizona sentinel., 1900-10-31

struct reservoirs or lakes in which to receive and store the overflow. There are natural basins or dry lakes into which by simple means the water could be conveyed.
 The lands situated in and about the Gila val lev may conveniently be classified as follows: First, the bottom or overflow lands; ?, slightly higher valleys lands subject to no overflow; B. mesas or sloping uplands; f. high but compar- atively level plains; g. mountains.
 The bottom lands, as well as those slightly higher, stretch along either side of the Gila and Colorado rivers for varying distances north and south until they meet the more elevated meSaS which rise from the valley. The bottoms lie directly along the river and are subject to inun- dation annually Immediately following the subsistence of the waters the local Indians were in former times accumtomed to plant corn, pumpkins, melons and other vegetables. These spring into maturity with startling rapidity, rarely failing to yield bountifully without addi- tional irrigation. The custom is occasionally followed by resident farmers to this day, with excellent results, although but single crop can be harvested. These bottoms form 25 per cent of the valley lands and may without difficulty be secured from further invasion by system Of dikes and leveeS, if deemed necessary and deSir- able The soil throughout the valley IS a rich brownish yellow sandy loam, generous, mellow, porous with depth ranging from to 20 feet, the whole resting upon underlying strata of gravel end sand that readily carry from the surface such excess of water as might otherwise prove injurious to seeds and growing plants
 Concerning the geological formation of these lands the following from the report of the citizens executive committee is sufficiently comprehensive:
 There is unmiStakable geologic evidence that all this land during some prehistoric period was covered with water constituting 1n fact an enormous lake, the surfaces rising in places to upper portion of the outSkirting mesaS. The soil lying at the bottom was made by the washing and erosion of the surrounding mountains. The soda from the decomposed vegetation, the mag nesia and lime from the magneSlum-llme forma- tionS, and the potash from the decompoSing granite rocks were carried with unceasing re- gularity year by year, until deposited in the bottom. Eventually upon the disappearance Of the lake, the rich fertile alluvium, than which there is none better, was left to reward the efforts of the modern huSbandmen. But nature, not yet satisfied with her handiwork, directed the accumulation of the detritus washed from | the distant mountainous region. As result, l the soil is extremely rich in the elements best adapted to thorough fertilization for it contains a certain amount of organic matter which, on decomposing further enhances it's agricultural value By constant overflow and change of channel the deposits are evenly distributed over | considerable areas, the process continuing through centuries. These soils are further en- riched by decomposed organic contributions, including the sandstones, marls, limestoneS, shales etc. Besides the ingredients mentioned, a chemical analysis shows that iron, ammonia, and phosphoric acid enter into it's composition in the proportions best adapted to add to its productive qualities. The extremes of tempera- ture are somewhat greater than on the high lands, but there is also more moisture.
 ''The bottom lands are so easily cultivated that it is not uncommon after clearing the sur face from the brush and Stubble, to pass over the ground with an ordinary cultivator a single time, afterwards sowing to grain and grass In three or four months large crops are harvested, the soil meanwhile being entirely innocent of the plow All plants seem to grow rapidly, maturing remarkably early. Indications of an cient dtches are apparent throughout the val | lev, showing plainly the existence of irrigation works by the ancient Aztecs. Curiously enough, | ln certain luSbduCcS, bHc lOuOCS Oi these long extinct people have been followed for codsideratable distances by their modern sue cessors."
 THE VALLEYS CT THE COLORADO.
 Several miles above Yuma in the neghbor- hood of Explorers Pass, near the Purple Hills, the great Colorado River Valley proper con- mences. From this point northerly the river is shut in by cliffs which, with intervening noun tain systems, absolutely preclude the possibility of canal construction. Passing southward, the cliffs are seen to gradually disappear until they become merged in the low bottom lands. The bottom meanwhile widens with every mile until the Gulf of California is reached. There are large quantities of land which could be made productive were irrigation practicable These are general fertile bottoms incining toward the river and covered in spots with dense under growth and cottonwood and mesquite trees. Considerable Of the ralley is raised above the