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The essence of the change may be conveyed in a single sentence. The sun was thenceforth regarded, not as a mere heated body, or still more remotely from the truth as a cool body unaccountably spun round with a cocoon of fire, but as a vast heat-radiating machine. The terrestrial analogy was abandoned in one more particular besides that of temperature.
"The plague of a smoking fireplace is proverbial," began Rumford in his treatise on the subject, written during his years in the service of the Elector of Bavaria. Stripped of the involved terminology characteristic of the natural philosopher of that day, his specifications for a smokeless, heat-radiating fireplace are very simple and depend on three fundamentals.
The surfaces of leaves are very efficient agents of radiation, and the tangle which they make offers an amount of heat-radiating area many times as great as that afforded by a surface of bared earth. Moreover, the ground itself can not well cool down to the point where it will wring the moisture out of the air, while the thin membranes of the plants readily become so cooled.
Her cheeks glowed as if every star in the heavens were a heat-radiating sun, and her very heart burned within her. And now, just as if she had begun it, as if she herself had struck up the tune, her companions ahead began to sing the song that had risen to her lips that morning: "There were two lovers in Allgau, Who loved each other so dear;
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