joined to another.

THEAETETUS: True.

STRANGER: But does every one know what letters will unite with what? Or

is art required in order to do so?

THEAETETUS: Art is required.

STRANGER: What art?

THEAETETUS: The art of grammar.

STRANGER: And is not this also true of sounds high and low?--Is not he

who has the art to know what sounds mingle, a musician, and he who is

ignorant, not a musician?

THEAETETUS: Yes.

STRANGER: And we shall find this to be generally true of art or the

absence of art.

THEAETETUS: Of course.

STRANGER: And as classes are admitted by us in like manner to be some of

them capable and others incapable of intermixture, must not he who would

Sophist