Ancilla to the Pre-Socratic Philosophers, by Kathleen Freeman, , at sacred-texts.com
Polycleitus of Argos was active during the latter half of the fifth century B.C.
He wrote a treatise called Canon, on aesthetics.
1. The most difficult stage of the work is when the artists clay is within a nail's breadth 1 (of completion?)
2. The right result comes gradually through many numbers.
72:1 Proverbial expression, the meaning of which is uncertain.