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must also be a miner original German: Bergkman; Walch argues that alchemy requires practical mining knowledge rather than just laboratory theory: He must allow himself into the mountain / travel through the tunnels original German: stellen; horizontal passages in a mine and shafts / observe the internal constitution / the veins original German: Gängen; mineral lodes and fissures / visit the ore faces original German: Ertzes anbruch; the specific locations where ore is first exposed and extracted where the miners original German: Bergknappen have their camps / take a visual inspection original German: Augenschein; first-hand empirical observation everywhere / and inquire about every necessity. Afterwards / when he comes out of the mountain again / he must diligently reflect upon these things / and talk with knowledgeable miners outside about what he has seen / heard / and experienced / and ruminate original German: ruminieren; to contemplate deeply or "chew over" the information with reason / so that from such secrets of nature / hidden from many and difficult work / he might in some measure gain an understanding / Philo-