Magnalia naturae: or, the philosophers-stone lately expos'd to publick sight and sale; being a true and exact account of the manner how Wenceslaus Seilerus the late famous projection-maker, at the Emperours court, at Vienna, came by, and made away with a very great quantity of pouder of projection, by projecting with it before the Emperor ... / By John Joachim Becher ... [by] Wenceslaus Seilerus ... Published at the request ... especially of Mr. Boyl [sic].

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Magnalia naturae: or, the philosophers-stone lately expos'd to publick sight and sale; being a true and exact account of the manner how Wenceslaus Seilerus the late famous projection-maker, at the Emperours court, at Vienna, came by, and made away with a very great quantity of pouder of projection, by projecting with it before the Emperor ... / By John Joachim Becher ... [by] Wenceslaus Seilerus ... Published at the request ... especially of Mr. Boyl [sic]. Public Domain Mark. Source: Wellcome Collection.