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ὁ δεσπότης καὶ ὁ δοῦλος ἐν τῷ ἀγρῷ εἰσιν.
ἔστι καὶ δένδρον ἐν τῷ ἀγρῷ .
καὶ ὑπὸ τῷ δένδρῳ πολλοὶ λίθοι.
βλέπομεν τὸν Δικαιόπολιν καὶ τὸν Ξανθίαν, τὸν δοῦλον,
τὸ δένδρον, τὸ ἕρμα, τοὺς λίθους.
ἀλλὰ οὐ βλέπομεν τὸν οἶκον.
ὁ δοῦλος λέγει · τοσοῦτοι λίθοι

ἐστιν ὁ Ξανθίας , λέγει οὖν ·
οὐ δυνατόν ἐστι τοσούτους λίθους ἐκφέρειν ἐκ τοῦ ἀγροῦ .

Why the λίθοι we saw on a pile under the tree outside of the field should now all be
ὑπὸ τῷ δένδρῳ ἐν τῷ ἀγρῷ
I do not know. It's definitely the same ἕρμα under the same tree as in Chapter 1b when
ὁ Δικαιόπολις μέγαν λίθον αἴρε καί ἐκφέρει ἐκ τοῦ ἀγροῦ πρὸς τὸ ἕρμα .
In other words
τὸ ἕρμα οὐκ ἔστιν ἐν τῷ ἀγρῷ , ἀλλὰ outside of it. Maybe some bad spirits carried pile and tree all back in overnight. Whatever, the stones are all back and have to be carried out, much to the disgust and dismay of lazy Xanthias.