BOOK III . 6 7 However , such a junction of veins sometimes disunites and in this way it happens that the vein which was the right - hand vein becomes the left ; and again , the one which was on the left becomes the right . Furthermore , one vein may be split and divided into parts by some hard… … A , B — Veins dividing . C — The same joining . Whether a vein is separating from or uniting with another can be deter mined only from the seams in the rocks . For example , if a principal vein runs from the east to the west , the rock seams descend in depth likewise from the east toward the west ,…
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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_000033125008455038-62-34.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_000033125008455038-51-18.webp)
