Passage 9.12.4
λέγεται δὲ καὶ τόδε, ὡς ὁμοῦ τῷ κεραυνῷ βληθέντι ἐς τὸν Σεμέλης θάλαμον πέσοι ξύλον ἐξ οὐρανοῦ· Πολύδωρον δὲ τὸ ξύλον τοῦτο χαλκῷ λέγουσιν ἐπικοσμήσαντα Διόνυσον καλέσαι Κάδμον. πλησίον δὲ Διονύσου ἄγαλμα, καὶ τοῦτο Ὀνασιμήδης ἐποίησε διʼ ὅλου πλῆρες ὑπὸ τοῦ χαλκοῦ· τὸν βωμὸν δὲ οἱ παῖδες εἰργάσαντο οἱ Πραξιτέλους .
The following story is also told: that at the same time as the thunderbolt struck Semele's chamber, a piece of wood fell from heaven. They say that Polydorus adorned this piece of wood with bronze and called it "Dionysus Cadmus." Near it stands a statue of Dionysus created by Onasimedes, entirely composed of solid bronze; the altar was made by the sons of Praxiteles.