Note 61 — Chapter XXVIII · THEÆTETUS.
Reading edition
The argument produced by Plato to discredit the Protagorean theory — that it puts the dog or the horse on a level with man — furnishes in reality a forcible illustration of the truth of the theory.
Mr. James Harris, the learned Aristotelian of the last century, remarks, in his Dialogue on Happiness (Works, ed. 1772, pp. 143-168):—
“Every particular Species is, itself to itself, the Measure of all things in the Universe. As things vary in their relations to it, they vary also in their value. If their value be ever doubtful, it can noway be adjusted but by recurring with accuracy to the natural State of the Species, and to those several Relations which such a State of course creates.”