The Arizona sentinel., 1901-03-20

struct reservoirs CT 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.
 1 The lands situated in and about the Gila val | ley 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; 1, high but compar- | atively level plains; 5, mountains.
 | The bottom lands as well aS those slightly
 higher, stretch along either side of the Gia and 1 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>thc river and are subject to inun dation annually. Immediately following the subsistence of the waters the local Indians were 1 in former times accumtomed to plant corn,
 pumpkins, melcns and other vegetables. These spring into maturity with startling rapidity,
 rarely failing to yield bountifully without addi- | tional irrigation. The custom is occasionally i followed by resident farmers to this day, with excellent results although but single crop can | De harvested These bottoms form 9 per cent of the valley lands, and may without difficulty be secured from further invasion by system of dilles and levees, if deemed necessary and Gesir able The soil throughout the valley is a rich brownish yellow sandy loam. generous, mellow, porous, with a depth ranging from to 70 feet, the whole resting upon underlying strata of gravel and sand that readily carry from the surface such cxcess of water as might oth,- wise 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 unmistalzahle geologic evidence that all this land during some prehistoric period was covered with water. constituting in fact an enormous lake, the surfaces rising in places to upper portion Of the outskirting mcSas 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 magLesium-lime forma- tionS, and the potash from the decOmpOSing granite rocks were carried with unccaSing re- gularity year by year, until deposited i'll the bottom. Eventually upon the disappearance of the lake, the rich fertile alluvium, than which there is none beter, was left to reward the efforts of the modern huSbandInen. But nature, not yet satisfied with her handiwork directed the accumulation of the dctrituS washed from the distant mountainous region. AS a result, the soil is extremely rich in the clements 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- richcd by decompoSed organic contributions, including the sandstones marlS, limestcncs, 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 it's 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 Stubblc. to pass over the ground with ordinary cultivator 8 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 blow. Al plants seem to grow rapidly. maturing remarkably early. Indications of an cient ditcheS are apparent throughout the val lev. showing plainly the existence of irrigation works by the ancient AZtecS. CurlouSly enough, in certain instances, the identical routes Of these long extinct people have been followed for codSideratable distances by their modern sue ceSSorS.