The page exhibits significant ink bleed-through from the reverse side, with mirrored text visible at the top and bottom of the leaf.

original: "ALTER ERAT TVNC TIPHYS, ET ALTERA QVAE VEHAT ARGO DELECTOS HEROAS. ERVNT ETIAM ALTERA BELLA." This is a quotation from Virgil's Eclogue IV. In the context of this 1624 work, Snellius uses it to suggest that a new age of maritime discovery and heroism is beginning, led by Dutch navigators.

Virgil, Eclogue IV, Tiphys (the pilot), Argo (the ship), Heroes

WILLEBRORD SNELL

of ROYEN, Son of Rudolph.

THE DUTCH

TIPHYS, In Greek mythology, Tiphys was the legendary pilot of the ship Argo; here, Snellius uses the name to frame himself as a mathematical guide for Dutch mariners.

OR

THE ART OF SAILING, original: Histiodromice, a technical term Snellius coined from the Greek words for "sail" and "running" or "course."

AND NAVAL AFFAIRS.

SLP Likely a library shelf-mark or shorthand reference code added by a later collector.

The printer's device of the Elzevir family depicts a scholar or hermit figure standing beside a large elm tree. The tree is entwined with a grapevine bearing clusters of fruit, illustrating the motto on a scroll woven through the branches: "NOT ALONE" (original: NON SOLVS), suggesting that wisdom and study provide their own companionship.