Read "Of Those Sentiments Concerning Nature with Which Philosophers Were Delighted" by Plutarch online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
Anaximenes declares that the circumference of heaven is the limit of the earth's revolution. Empedocles, that the heaven is a solid substance, and hath the form and hardness of crystal, it being composed of the air compacted by fire, and that in both hemispheres it invests the elements of air and fire. Aristotle, that it is formed by the fifth body, and by the mixture of extreme heat and cold.