(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.

(62) Timaeus: the origin of its form, how that it above all others is the one substance which so divides our bodies and minces them up as to produce naturally both that affection which we call “heat” and its very name. The opposite affection is evident, but none the less it must not lack description. When liquids with larger particles, which surround the body, enter into it they drive out the smaller particles; but as they cannot pass into their room they compress the moisture within us, so that in place of non-uniformity and motion they produce immobility and density,

(57) Timaeus: whenever a few of the smaller corpuscles, being caught within a great number of larger corpuscles, are broken up and quenched, then, if they consent to be re-compounded into the shape of the victorious Kind, they cease to be quenched, and air is produced out of fire, and out of air water; but if they fight against combining with these or with any of the other Kinds, they do not cease from dissolution until either they are driven out to their own kindred, by means of this impact and dissolution, or else they are defeated and, instead of many forms, assume one form similar to the victorious Kind, and continue dwelling therewith as a united family. Moreover, it is owing to these affections

(58) Timaeus: So likewise of air, there is the most translucent kind which is called by the name of aether, and the most opaque which is mist and darkness, and other species without a name, which are produced by reason of the inequality of the triangles. The kinds of water are, primarily, two, the one being the liquid, the other the fusible kind. Now the liquid kind, inasmuch as it partakes of those small particles of water which are unequal, is mobile both in itself and by external force owing to its non-uniformity and the shape of its figure. But the other kind, which is composed of large

(56) Timaeus: and the fractions of air which come from the dissolving of one particle will form two corpuscles of fire. And again, when a small quantity of fire is enclosed by a large quantity of air and water, or of earth, and moves within them as they rush along, and is defeated in its struggle and broken up, then two corpuscles of fire unite to make one form of air. And when air is defeated and disintegrated, from two whole forms of air and a half, one whole form of water will be compounded.

(19) And so every Element qualifies [or acts] in its own Source [or Manner of Operation,] and one could do nothing without the other, neither could one have any Mobility without the other. For one generates the other, and they go all four out of one Original, and it is in its Birth but one only [Thing or] Substance as I have mentioned before at large about the Creation, concerning the Birth of the four Elements.

(4) In the Year or as regards Time, these three mothers represent Heat, Cold, and a Temperate climate, the heat from the fire, the cold from the water, and the temperate state from the spiritual air which again is an equalizer between them.

(2) Air is, therefore, twofold in nature-tangible atmosphere and an intangible, volatile substratum which may be termed spiritual air. Fire is visible and invisible, discernible and indiscernible--a spiritual, ethereal flame manifesting through a material, substantial flame. Carrying the analogy further, water consists of a dense fluid and a potential essence of a fluidic nature. Earth has likewise two essential parts--the lower being fixed, terreous, immobile; the higher, rarefied, mobile, and virtual. The general term elements has been applied to the lower, or physical, phases of these four primary principles, and the name elemental essences to their corresponding invisible, spiritual constitutions. Minerals, plants, animals, and men live in a world composed of the gross side of these four elements, and from various combinations of them construct their living organisms.

(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

(79) Timaeus: the other by way of the mouth and the nose, whenever the fire rushes in one direction it propels the air round to the other, and the air which is thus propelled round becomes heated by streaming into the fire, whereas the air which passes out becomes cooled. And as the heat changes its situation and the particles about the other outlet become hotter, the hotter body in its turn tends in that direction, and moving towards its own substance propels round the air which is at the former outlet; and thus the air, by continually undergoing and transmitting the same affections, causes inspiration and expiration to come about as a result of this double process, as it were a wheel that oscillates backwards and forwards. Moreover, we must trace out in this way the causes of the phenomena connected with medical cupping-glasses,

(32) As Fire, Air, Water, and Earth, lie in one Case, [or Chest,] and they four are but one Thing, and yet of four distinct Differences, and none of them can comprehend, nor retain the other, and something of one of the four being fixed in every Creature, that Creature cannot bind itself as to that, but is manifested therein, and according to that Spirit is comprehensible and perceptible, and yet is incomprehensible to the Spirits of the other Elements.

(61) Timaeus: Thus earth when it is not forcibly condensed is dissolved only by water; and when it is condensed it is dissolved by fire only, since no entrance is left for anything save fire. Water, again, when most forcibly massed together is dissolved by fire only, but when massed less forcibly both by fire and air, the latter acting by way of the interstices, and the former by way of the triangles; but air when forcibly condensed is dissolved by nothing save by way of its elemental triangles, and when unforced it is melted down by fire only. As regards the classes of bodies which are compounds of earth and water,