. The geography of Texas, physical and political. ^ wells, it is sought for by boring or underground waters are reached by this method, theyoften burst forth under pressure, sometimes even throw-ing a stream high in the air, at other times rising many feet in the drill holewithout reachingthe surface. Suchwaters are called ar-tesian. Their sourceis far away and theyhave traveled longdistances throughsandy and other rocklayers which mustbe inclined. In aridor semiarid regions,or where the surfacesupply is very irreg-ular, artesian wellsare of the greatestvalue both for drink-ing a
. The geography of Texas, physical and political. ^ wells, it is sought for by boring or underground waters are reached by this method, theyoften burst forth under pressure, sometimes even throw-ing a stream high in the air, at other times rising many feet in the drill holewithout reachingthe surface. Suchwaters are called ar-tesian. Their sourceis far away and theyhave traveled longdistances throughsandy and other rocklayers which mustbe inclined. In aridor semiarid regions,or where the surfacesupply is very irreg-ular, artesian wellsare of the greatestvalue both for drink-ing and for irrigat-ing purposes. The artesian areais almost entirelyconfined to the Gulf. Fig. 22. Artesian Well on Bosque Farm,(as it appeared in 1890) Four MilesWest of Waco, McLennan County, and248 Feet above the Public Square slope. Thus far wells have shown the existence of water-bearing strata in certain formations belonging to four ofthe rock systems — the Neocene, the Eocene, the Creta-ceous, and the Carboniferous. The waters of the last, inthe Central basin, contain so much mineral matter as to be SURFACE AND UNDERGROUND WATERS 37 of little value, and some of the wells near the coast furnishbrackish or sulphurous waters. Of the water-bearing beds,those of the lowermost Cretaceous, known as the Trinity
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