Agricola, Georgius - De re metallica

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1even tin and bismuth6 are treated differently from lead. Although the
evaporation of juices is an art apparently quite distinct from metallurgy,
yet they ought not to be considered separately, inasmuch as these juices
are also often dug out of the ground solidified, or they are produced from
certain kinds of earth and stones which the miners dig up, and some of the
juices are not themselves devoid of metals. Again, their treatment is not
simple, since there is one method for common salt, another for soda7,
another for alum, another for vitriol8, another for sulphur, and another
for bitumen.

Furthermore, there are many arts and sciences of which a miner should
not be ignorant. First there is Philosophy, that he may discern the origin,
cause, and nature of subterranean things; for then he will be able to dig
out the veins easily and advantageously, and to obtain more abundant results
from his mining. Secondly, there is Medicine, that he may be able to look
after his diggers and other workmen, that they do not meet with those

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