4° (mm 216x170); 99 not numbered leaves including engraved title, 1 engraved plate and 35 engraved portraits of the main scholars and professors of the University of Leiden among which Justus Lipsius, Pietro Foresti, Snellius, Dodonaeus, Merula, Bertius, Grotius, Clusius, Polyander. XIX century half vellum. Good condition with some little stains and spots. The plate is partly cut at top in margin. Manuscript ownership at foot of titlepage. A little engraved portrait of Carolus Clusius is attached.