But , while the seams usually run from one point of the compass to another immediately opposite it , as for instance , from east to west , if hard stringers divert them , it may happen that these very seams , which before were running from east to west , then contrariwise proceed from west to east… … A — Seams which proceed from the east . B — The inverse Both veins or stringers may be solid or drusy , or barren of minerals , or pervious to water . Solid veins contain no water and very little air . The drusy veins rarely contain water ; they often contain air . Those which are barren of…
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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 Mundus subterraneus, in XII libros digestus : qvo divinum subterrestris mundi opificium, mira ergasteriorum naturae in eo distributio, verbo [pantamorphon] Protei regnum, universae denique naturae majestas & divitiae summa rerum varietate exponuntur, abditorum effectuum causae acri indagine inquistae demonstrantur, cognitae per artis & naturae conjugium ad humanae vitae necessarium usum vario experimentorum apparata, necnon novo modo & ratione applicantur. Ad Alexandrum VII. pont. opt. max. (1678)](https://img.insideoutlibrary.com/img/200/ia-mundussubterrane02kirc-287-154.webp)
