n . The other two compartments have iron doors which are closed , and which , together with the roof , keep in the heat when the wood is lighted . In these upper compartments are iron bars which take the place of a floor , and on these are arranged pots without bottoms , having in place of a bottom… … A — Heap of cupriferous stones . B — Kindled heap . C — Stones being taken to THE BEDS OF FAGGOTS . ’ Bearing in mind that bituminous cadmia contained arsenical - cobalt minerals , this substance resembling pompholyx would probably be arsenic oxide . In De Natura Fossihum ( p . 368 ) Agricola…
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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_000033125008455038-294-207.webp)
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