SOCRATES: And in the productive or handicraft arts, is not one part more akin to knowledge, and the other less; and may not the one part be regarded as the pure, and the other as the impure?
PROTARCHUS: Certainly.
SOCRATES: Let us separate the superior or dominant elements in each of them.
PROTARCHUS: What are they, and how do you separate them?
SOCRATES: I mean to say, that if arithmetic, mensuration, and weighing be taken away from any art, that which remains will not be much.
PROTARCHUS: Not much, certainly.
SOCRATES: The rest will be only conjecture, and the better use of the senses which is given by experience and practice, in addition to a certain power of guessing, which is commonly called art, and is perfected by attention and pains.
PROTARCHUS: Nothing more, assuredly.
SOCRATES: Music, for instance, is full of this empiricism; for sounds are harmonized, not by measure, but by skilful conjecture; the music of the flute is always trying to guess the pitch of each vibrating note, and is therefore mixed up with much that is doubtful and has little which is certain.
PROTARCHUS: Most true.