Passage 7.18.11
ἄγουσι δὲ καὶ Λάφρια ἑορτὴν τῇ Ἀρτέμιδι οἱ Πατρεῖς ἀνὰ πᾶν ἔτος, ἐν ᾗ τρόπος ἐπιχώριος θυσίας ἐστὶν αὐτοῖς. περὶ μὲν τὸν βωμὸν ἐν κύκλῳ ξύλα ἱστᾶσιν ἔτι χλωρὰ καὶ ἐς ἑκκαίδεκα ἕκαστον πήχεις· ἐντὸς δὲ ἐπὶ τοῦ βωμοῦ τὰ αὐότατά σφισι τῶν ξύλων κεῖται. μηχανῶνται δὲ ὑπὸ τὸν καιρὸν τῆς ἑορτῆς καὶ ἄνοδον ἐπὶ τὸν βωμὸν λειοτέραν, ἐπιφέροντες γῆν ἐπὶ τοῦ βωμοῦ τοὺς ἀναβασμούς.
The people of Patrae also hold each year the festival called Laphria in honor of Artemis, during which they have a local custom of sacrifice. They pile green logs around the altar in a circle, each log sixteen cubits high; and within, upon the altar itself, they place the driest of their wood. At the time of the festival, they also construct an ascent to the altar that is made smoother by heaping earth upon the steps.