Glaucus, while still a child, was playing ball one day in the palace at Cnossus or, perhaps, chasing a mouse, when he suddenly disappeared. Minos and Pasiphaë searched high and low but, being unable to find him, had recourse to the Delphic Oracle. They were informed that whoever could give the best simile for a recent portentous birth in Crete would find what was lost. Minos made enquiries and learned that a heifer-calf had been born among his herds which changed its colour thrice a day – from white to red, and from red to black. He summoned his soothsayers to the palace, but none could think of a simile until Polyeidus the Argive, a descendant of Melampus, said: ‘This calf resembles nothing so much as a ripening blackberry [or mulberry].’ Minos at once commanded him to go in search of Glaucus.
Polyeidus wandered through the labyrinthine palace, until he came upon an owl sitting at the entrance to a cellar, frightening away a swarm of bees, and took this for an omen. Below in the cellar he found a great jar used for the storing of honey, and Glaucus drowned in it, head downwards. Minos, when this discovery was reported to him, consulted with the Curetes, and followed their advice by telling Polyeidus: ‘Now that you have found my son’s body, you must restore him to life!’ Polyeidus protested that, not being Asclepius, he was incapable of raising the dead. ‘Ah, I know better, replied Minos. ‘You will be locked in a tomb with Glaucus’s body and a sword, and there you will remain until my orders have been obeyed!’
When Polyeidus grew accustomed to the darkness of the tomb he saw a serpent approaching the boy’s corpse and, seizing his sword, killed it. Presently another serpent, gliding up, and finding that its mate was dead, retired, but came back shortly with a magic herb in its mouth, which it laid on the dead body. Slowly the serpent came to life again.
Polyeidus was astounded, but had the presence of mind to apply the same herb to the body of Glaucus, and with the same happy result. He and Glaucus then shouted loudly for help, until a passer-by heard them and ran to summon Minos, who was overjoyed when he opened the tomb and found his son alive. He loaded Polyeidus with gifts, but would not let him return to Argos until he had taught Glaucus the art of divination. Polyeidus unwillingly obeyed, and when he was about to sail home, told Glaucus: ‘Boy, spit into my open mouth!’ Glaucus did so, and immediately forgot all that he had learned.