The American journal of science and arts . Fig. Another dike runs nearly parallel with this in the field on thewest, which a little farther south, beyond the guide-boaid, may beobserved as No. 2, crossing the E. and W. road in two veins, twentyinches apart—eastern one four inches, and western three incheswide—the former containing imbedded fragments of granite, thelatter dividing into two branches, that become mere lines. Fig. 1. North of this road, in the field, this dike is again uncovered,and appears in two veins fourteen inches apart. The eastern dike Mineralogy and Geology of the Whit
The American journal of science and arts . Fig. Another dike runs nearly parallel with this in the field on thewest, which a little farther south, beyond the guide-boaid, may beobserved as No. 2, crossing the E. and W. road in two veins, twentyinches apart—eastern one four inches, and western three incheswide—the former containing imbedded fragments of granite, thelatter dividing into two branches, that become mere lines. Fig. 1. North of this road, in the field, this dike is again uncovered,and appears in two veins fourteen inches apart. The eastern dike Mineralogy and Geology of the White Mountains. 107 is one and a half inches, and the western, four to six inches wide,and they become, as suggested above, at the distance of sometwenty rods north, one larger dike. Fig. 2. The occurrence of the two veins in the field, after one hadseemed to terminate, and the change of the vein of greater di-mensions from the eastern to the western side, are only some ofthe phenomena frequently observed in trap dikes, several ofwhich will herea
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