Theatrum naturae et artis

(d) And they imitate the nature of natural stones; although in examination such are not detected as would have ascended to the perfection of these.

Nor do we neglect sulfur (a), bitumen (b), and others, which come under the name of fossils (c).

(a) Which is either native, and sometimes distills in caves like hardened ice, and sometimes is truly dug up; or artificial, which is prepared from sulfurous ores.

(b) Especially concrete, to which I also refer Prussian amber, which is collected at the seashore: fossil coal from various places.

(c) Such as the fossil unicorn horn dug up in various places: the lower part of a stag's horn, the whole of whose metal ore was extracted from a mine that had lain intact for a long time: and other bones of large animals dug out from the earth.

Concerning Meteors

Although more could be shown, we shall be occupied only with wind (a) and the rainbow (b).

(a) Whose origin and progress we demonstrate in a brass aeolipile a simple bladeless radial steam turbine, equipped with a curved neck, which, if it has any water in it and is subsequently placed on a fire, belches out wind and can be like a bellows blowing without interruption. If a whistle is applied to that neck, it will give various melodies.