56 BOOK III . Others , on the contrary , run from north to south . … A , B , C — Vein . D , E , F — Seams in the Rocks . The seams in the rocks indicate to us whether a vein runs from the east or from the west . For instance , if the rock seams incline toward the westward as they descend into the earth , the vein is said to run from east to west ; if they incline…
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