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Veins. *3* be many deviations from that during fo long a courfe. 6. Veins are ufually much inclined, always more fo than beds: the average inclination of beds is 4^°, that of veins much higher. In in clined veins, the upper fide is denominated the hanging fide, and the lower fide the lyingfide. 2. Structure and Internal,Relations of Veins. 1. The mafs or body of a vein, as we have al ready obferved, is almoft always different from that of the rock which it traverfes. In fome cates, however, we difcover relemblances between raoun- tain-ftones and vein-ttones. lnftances of this kind are porphyry and granite. 2. h principal character of veins is their divi- fion into branches. The vein is fometimes di vided into many branches by fragments of the wa//j(nebengeftetn)*j or, branches (hoot out from the fides of the vein in different direftions, and either terminate gradually in the rock at a greater or lefs diftance from the vein, or, by winding, again join it. It is obferved that fmall veins ufually terminate in the manner of thefe lateral branches \ but large veins, on the contrary, divide into numerous branches * The walls of a vein are the fi les of the original fiflure, or ye that, pat t of the mountain-rock which immediately bounds the lidos of the vein.