', abth. i.,
bd. i., s. xxxii.) Also, at St. Daniel and at Geish, on the Rorerbubel, in
the 'Landgericht' (or provincial district) of Kitzbuhl, there were, in the
sixteenth century, excavations of 3107 feet. The plans of the works of the
Rorerbubel are still preserved. (See Joseph von Sperges, 'Tyroler
Bergwerksgeschichte', s. 121. Compare, also, Humboldt, 'Gutachten uber
??erantreibung des Meissner Stollens in die Freiberger Erzrevier', printed
in Herder, 'uber Herantreibung des Meissner Stollens in die Freiberger
Erzrevier', printed in Herder, 'uber den jetz begonnenen Erbstollen', 1838,
s. cxxiv.) We may presume that the knowledge of the extraordinary depth of
the Rorerbuhel reached England at an early period, for I find it remarked in
Gilbert, 'de Magnete', that men have penetrated 2400 or even 3000 feet into
the crust of the Earth. ("Exigua videtur terrae portio, quae unquam
hominibus spectanda emerget aut eruitur; cum profundinus in ejus viscera,
ultra efflorescentis extremitatis corruptelam, aut propter aquas in magnis
fodin, tanquam per venas scaturientesaut propter seris salubrioris ad vitam
operariorum sustinendam necessarii defectum, aut propter ingentex sumptus ad
tantos labores exantlandos, multasque difficultates, ad profundiores terrz'
partes penetrre non possumus; adeo ut quadrigentas aut [quod rarissime]
quingentas orgyas in quibusdam metallis descendisse, stupendus omnibus
videatur connatus.
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