The monument has numerous symbols and inscriptions used in alchemy. The inscriptions are hard to read from the monument itself.
Around the circle at top: “The center is in the triangle of the center.”  Also: “There are three marvels: God and man, mother and virgin, triune and one.”
The Hebrew inscription, Ruach Elohim, means “Spirit of God.”  Beneath it: “The 
Hesperius dragon guards the entrance of the magic garden, and, without Alcides, Jason would not have tasted the delights of Colchis.”
There are six sigils on the jambs, each with its phrase.
Saturn/Lead: “When in your house black crows give birth to white doves, then you will be called wise.”
Jupiter/Tin: “The diameter of the sphere, the tau of the circle, the cross of the globe do not benefit the blind.”
Mars/Iron: “He who can burn with water and wash with fire, makes heaven from earth and precious earth from heaven.”
Venus/Bronze: “If you will make the earth fly upon your head, you will convert the waters of torrents to stone by its feathers.”
Mercury: “Azoth and Fire: by whitening Latona, Diana will come without dress.”
Antimony: “Our son lives dead, the king returns from the fire, and enjoys the occult conjunction.”
On the base, Vitriol: “It is occult work of true wise to open the earth, so as he may germinate health/safety for people.”
In another plate, now lost, was the device VILLAE IANUAM TRANANDO RECLUDENS IASON OBTINET LOCUPLES VELLUS MEDEAE 1680 (Passing by opening the door of the villa, Iason obtained the rich fleece of Medea 1680).
And on the doorstep, “SI SEDES NON IS,” a palindrome, meaning both “If you sit, you do not go,” and “If you do not sit, you go.”