De primo frigido

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Concerning the First Principle of Cold (eng) Plutarch. Plutarch's Morals, Vol. V. Goodwin, William W., editor; Fetherstone, F., translator. Boston: Little, Brown, and Company; Cambridge: Press of John Wilson and Son, 1874. On the Principle of Cold (eng) Plutarch. Moralia, Vol. XII. Cherniss, Harold and William C. Helmbold, translators. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1957 (printing).