The fiery mind is by its nature most liable to wrath. For as there are the four elements of fire, water, air, and earth, so there are the corresponding properties, the hot, the cold, the dry, and the moist.15 Accordingly, the various differences of regions, of animals, of substances, and of characters are caused by the mingling of the elements; consequently, also, dispositions show a greater bent in some one direction, according as they abound in a larger supply of some one element. Hence it is that we call some regions moist, some dry, some hot, some cold. The same distinctions apply to animals and to men; it makes a great difference how much of the moist and the hot each man has in him; his character will be determined by that element in him of which he will have a dominant proportion. A fiery constitution of mind will produce wrathful men, for fire is active and stubborn; a mixture of cold makes cowards, for cold is sluggish and shrunken. Consequently, some of our school hold that anger is aroused in the breast by the boiling of the blood about the heart; the reason why this particular spot is assigned to anger is none other than the fact that the warmest part the whole body is the breast. In the case of those who have more of the moist in them, anger grows up gradually because they have no heat ready at hand but obtain it by movement, and so the anger of children16 and women is more vehement than serious, and it is lighter at the start. In the dry periods of life17 anger is powerful and strong, but is without increase, showing little gain because cold succeeds heat,18 which is now on the decline. Old men are simply testy and querulous, as also are invalids and convalescents and all whose heat has been drained either by exhaustion or by loss of blood; the same is the condition of those who are gaunt from thirst and hunger and of those whose bodies are anaemic and ill-nourished and weak. Wine kindles anger because it increases the heat; some boil over when they are drunk, others when they are simply tipsy, each according to his nature. And the only reason why red-haired and ruddy people are extremely hot-tempered is that they have by nature the color which others are wont to assume in anger for their blood is active and restless.