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In this communication the author discusses the theory of the constitution of flame advanced by Professor Draper of New York, in his paper “On the Production of Light by Chemical Action,” which appeared in the Philosophical Magazine for 1848.
Professor Draper refers to experiments which prove that the higher the temperature of an incandescent body, the more refrangible are the rays of light emitted by it. He assumes that the temperature of the outer portions of a flame is greater than that of the interior regions; for outside there is a better supply of oxygen, and hence a more intense combustion is maintained.