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OF HEALTH, SICKNESS, AND OLD AGE.
Alcmaeon says that the preserver of health is an equal proportion of the qualities of heat, moisture, cold, dryness, bitterness, sweetness, and the other qualities; on the contrary, the prevailing empire of one above the rest is the cause of diseases and author of destruction.

The direct cause of disease is the excess of heat or cold, the formal cause is excess or defect, the place is the blood or brain.

But health is the harmonious commixture of the elements.

Diocles, that sickness for the most part proceeds from the irregular disposition of the elements in the body, for that makes an ill habit or constitution of it.