Agricola, Georg, De re metallica Libri XII, Quibus Officia, Instrumenta, Machinae, ac omnia ..., 1556

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1 124[Figure 124]
Dixi de uarijs arenæ, in qua auri ramenta inſunt, lauandæ rationib. nunc dicam
de materiæ permiſtæ cum lapillis nigris, ex quib.
plumbum candidum conficitur,
lauandæ rationib.
quarum octo ſunt uſitatæ: atque ex his duæ nuper inuentæ. Ta
lis aut materia metallica plerunque à uenis & fibris impetu aquarum abrepta lon
gè lateque reperitur: etſi interdum uenæ dilatatæ ex eadem conſtant: illam materiam
foſſores ligonib.
latis eruunt, hanc cuſpidatis effodiunt: ſed anatis roſtro ſimili
bus excindunt lapillorum expertem: quæ non raro in id genus uenis reperiri ſo­
let.
Verum in locis, qui eam continent, ſi abundauerint aquis, & ualleſtres aut mol
liter deuexi & concaui fuerint, ut riui in eos deduci poſſint, lotores æſtiuis di
ebus primo foſsam agunt longam & decliuem, ut aquæ permanantes rapidè ferantur.

Deinde materiam metallicam foſſa acta detectam unà cum cute, quæ alta eſt pedes
plus minus ſex, & coagmentata conſtat ex muſco, ex radicib.
herbarum, fruticum,
arborum, ex terra, utrinque ligonib.
latis fodiunt, et in aquas, quæ manant per foſ­
ſam, deijciunt.
Tum arenæ & lapilli nigri, quod graues ſint, in fundo foſſæ reſi­
dent
: muſcum et radices, quod leues, aquæ ex foſſa defluentes rapiunt.
Ne uerò ſimul
rapiant lapillos nigros infimum foſſæ ceſpitib.
& lapidib. obſtruitur: at ipſi lo­
tores, quorum pedes teguntur altis peronibus ex corio, non tamen crudo, factis,
ſtant in foſſa, & radices arborum fruticum herbarum ligneis furcis ſepticornibus
ex ea eijciunt: atque lapillos nigros ad caput foſſæ repellunt.
Poſtque ſpacio qua
tuor hebdomadarum in hac re conſumpſerint multum operæ & laboris, iſto mo
do tollunt lapillos nigros: arenam cum ipſis miſtam identidem ex foſſa batillis ferreis
ſublatam huc & illuc in aquis agitant uſque dum arena ex eis defluat & deci­
dat in foſſam, ſoli lapilli nigri reſtent: quos omnes collectos rurſus in lacu­

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