On the Principle of Cold (5-9)

And yet another point: privation of any sort is something simple and uncomplicated, whereas substances have many differences and powers. Silence, for example, is of only one kind, while sound varies, sometimes annoying, at other times delighting, the perception. Both colours and figures show the same variation, for they produce different effects on different occasions when they meet the eye; but that which cannot be touched and is without colour or any quality whatever, admits no difference, but is always the same.

Is cold, then, so like this sort of privation that

Furthermore, given four primary bodies in the universe[*] which, because of their quantity, simplicity, and potentiality, most judges regard as being the elements or first principles of everything else - I mean fire, water, air, and earth - the number of primary, simple qualities must be the same. And what should these be but warmth and cold, dryness

Perhaps we should now leave the question whether heat and cold are substances; if so, let us advance the argument to the next point and inquire what sort of substance coldness has, and what is its first principle and nature. Now those who affirm that there are certain uneven, triangular formations in our bodies[*] and that shivering and trembling, shuddering and the like manifestations, proceed from this rough irregularity, even if they are wrong in the particulars, at least derive the first principle from the proper place; for the investigation should begin, as it were from the very hearth,[*] from the substance of all things. This is, it would seem, the great difference between a philosopher and a physician or a farmer or a flute-player; for the latter are content to examine the causes most remote from the first cause, since as soon as the most immediate cause of an effect is grasped - that fever is brought about by exertion or an overflow of blood, that rusting of grain is caused by days of blazing sun after a rain, that a low note is produced by the angle and construction of the pipes - that is enough to enable a technician to do his proper job. But when the natural philosopher sets out to find the truth as a matter of speculative knowledge, the discovery of immediate causes is not the end, but the beginning of his journey to the first and highest causes. This is the reason why Plato and Democritus,[*] when they were inquiring into the causes of heat and heaviness, were right not to stop their investigation with earth and fire, but

Nevertheless it is better for us first to attack things perceptible to the senses,in which Empedocles[*] and Strato[*] and the Stoics[*] locate the substances that underlie the qualities, the Stoics ascribing the primordially cold to the air, Empedocles and Strato to water; and someone else may, perhaps, be found to affirm that earth is the original substance of coldness.[*] But let us examine Stoic doctrine before the others.

Since fire is not only warm but bright, the opposite natural entity (they say) must be both cold and dark: as gloomy is the opposite of bright, so is cold of hot. Besides, as darkness confounds the sight, so cold confuses the sense of touch. Heat, on the other hand, transmits the sensation of touching, as brightness does that of seeing. It follows, then, that in nature the primordially dark is also the primordially cold; and that it is air which is primordially dark does not, in fact, escape the notice of the poets since they use the term air for darkness:

Thick air lay all about the ships, nor could

The moon shine forth from heaven.[*]

So clad in air they visit all the earth.[*]

The air at once he scattered and dispelled the mist;

The sun shone forth and all the battle carne in view.[*]