1579 Michael MAIER.
De circulo physico, quadrato: hoc est, Auro, eiusque virtute medicinali, sub duro cortice instar nuclei latente; An et qualis inde petenda sit, Tractatus haud inutilis.
4° Oppenheimii: typis Hieronymus Galleri, sumptibus Lukas Jennis 1616
Ferguson British Library Wisconsin
[Illustration:-
Engraving on title-page. 74x74mm. A square within a circle, associating the four elements with the four qualities.]