Iknow of no one thing more significant for an under- standing of Greek science than Aristotle's treatment of quantity as an accident, that is, as something which can vary within limits (set by the inherent essence and measure, logos) of a thing without affecting its nature. When we think of the Cartesian definition of quantity as the essence of matter, we appreciate that an intellectual revolution has taken place: a radical change in point of view and not just the product of more, and more accurately stated, information, but achange involving surrender of the esthetic character of the object. Contrast the place occupied in modern science by relations with the Aristotelian illustrations of their nature namely, distinc- tions of more and less, greater and smaller, etc. For the point of Aristotle's treatment is that relations, like quantity, are indifferent to the essence or nature of the object, and hence are of no final account for scientific knowledge. This conception is thoroughly appropriate to an esthetic point of view, wherein that which is internally complete and self-sufficing is the all- important consideration.