Eudoxus lays out a skesis based on logos. He lays it out on the ground in position. First and second position as I have defined it is at cross purposes with Eudoxus, because he redefines it in haloes as first and third position! This is because he wants to compare two logoi. The second logos he places in second and fourth position. Now he can look at the logos between first and second positions and comment on them by the logos in third and fourth position!
ϛʹ. Τὰ δὲ τὸν αὐτὸν ἔχοντα λόγον μεγέθη ἀνάλογον καλείσθω.