  From this Albert concludes that the science of the human body might be subalternated to mathematics, after all, and when Aristotle says medicine is not subalternate to geometry, he only means that the whole of medicine is not subalternate to geometry in the way that the whole of optics is, say. Instead, only a few medical demonstrations are subalternate to geometry. They are, however, subalternate to geometry in exactly the same way as the demonstrations in optics are, for optics is the science of light, and geometry bears only on certain accidents of light, not on light itself, and does not explain why light has those accidents.