Printer's mark of Johan Arnold Langerak in ornamental frame

Printer's mark of the Leiden printer Johan Arnold Langerak, depicting Minerva handing a bull with accompanying honors to a young man. Fame flies above. In the background a river god. Around the oval the motto "Virtute ac studio per orbem Fama perpetitia comparatur". Surrounded by oak and olive branches and four coats of arms, including that of the city of Leiden. On a ribbon the name of Langerak. In the frame a fasces, balance, measuring instruments, an alembic, a snake, books with texts from classical antiquity, and the portraits of Justinianus and Hippocrates. Within the frame in book type the title of the dissertation on which David Radaeus at the University of Leiden, under the authority of rector magnificus Herman Boerhaave, was promoted to doctor in both laws on March 30, 1714.