in their lateral directions , and we are able to understand from the seams in the rocks in which direction they extend into the ground . For if these incline toward the west in depth , the vein is said to extend from east to west ; if on the contrary , they incline toward the east , the vein is… … A , B — Venae dilatatae . C — Seams in the Rocks . Further , as regards the question of direction of a vena profunda , one runs straight from one quarter of the earth to that quarter which is opposite , while another one runs in a curve , in which case it may happen that a vein proceeding from the…
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![An illustration from Georgii Agricolae De re metallica : libri XII. Quibus officia, instrumenta, machinae, ac omnia deni[que] ad metallicam spectantia, non modo luculentissimè describuntur, sed & per effigies, suis locis infertas, adiunctis latinis, germanicis [que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. ; Eiusdem De animantibus subterraneis liber, (1556)](https://img.insideoutlibrary.com/img/200/ia-gri_000033125008455038-66-39.webp)
![An illustration from Georgii Agricolae De re metallica : libri XII. Quibus officia, instrumenta, machinae, ac omnia deni[que] ad metallicam spectantia, non modo luculentissimè describuntur, sed & per effigies, suis locis infertas, adiunctis latinis, germanicis [que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. ; Eiusdem De animantibus subterraneis liber, (1556)](https://img.insideoutlibrary.com/img/200/ia-gri_000033125008455038-231-148.webp)
