(44) As an illustration of the fact just stated, we may consider the two opposites known as Hot and Cold, respectively; surely there can be no two qualities apparently more distinct and separate from each other—more diametrically different from each other. But careful examination shows us that the two contrasting things are really but degrees, conditions, and states of the same thing. There is no such thing as an "absolute hot," or an "absolute cold." There are merely different degrees of this Hot-Cold pair of opposites, which for convenience we call "Heat." We cannot point out a place on the thermometer where Hot ceases and Cold begins, or vice versa. The two states or conditions blend into each other, and any statement regarding them is found to be merely comparative. If we place one hand in a bowl of very hot water, and the other in a bowl of ice-cold water, and then suddenly withdraw both hands and plunge them into a bowl of lukewarm water, what happens d Simply this, that we find that the hot-water hand feels a sensation of coolness, while the cold-water hand feels a sensation of heat—each experience resulting from the comparison with the previous experience.

(74) Timaeus: and, inasmuch as it contains within it warm moisture, that it should supply in summer, by its perspiration and dampness, a congenial coolness over the exterior of the whole body, and contrariwise in winter defend the body sufficiently, by means of its fire, from the frost which attacks and surrounds it from without. Wherefore, with this intent, our Modeller mixed and blended together water and fire and earth, and compounding a ferment of acid and salt