284 Anton Günther BILLICH. Obervationum ac paradoxorum chymiatricorum libri duo: quorum unus medicamentorum chymicorum praeparationem: alter eorundem usum succincte perspicuèque explicat. 4° Lugduni Batavorum. Ex officina Ioannis Maire 1631 Young Nat Union Cat British Library Wisconsin [Illustration:- Engraved titlepage. 141x93mm. Conventional design with two columns. A plaque in the lower centre has a crucible in a flaming furnace with the text "Donec purum", while on the base of the rightmost column is the depiction of a hand emerging from a cloud and holding a caduceus.]