consisting of fire, air, earth, and water, so there are powers corresponding and equivalent to each of these, namely, hot, cold, dry, and moist. Now the mixture of the elements is the cause of the diversities of lands and of animals, of bodies and of character, and our dispositions incline to one or the other of these according as the strength of each element prevails in us. Hence it is that we call some regions wet or dry, warm or cold. The same distinctions apply likewise to animals and mankind; it makes a great difference how much moisture or heat a man contains; his character will partake of whichever element has the largest share in him. A warm temper of mind will make men prone to anger; for fire is full of movement and vigour; a mixture of coldness makes men cowards, for cold is sluggish and contracted. Because of this, some of our Stoics think that anger is excited in our breasts by the boiling of the blood round the heart: indeed, that place is assigned to anger for no other reason than because the breast is the warmest part of the whole body.