First step in the discovery--Animal Heat the product of Respiration. Second step--Heat evolved in the lungs by Respiration there produces Expansion. Third step--Expansion; implied motion, which from the organism must conduct the blood to the left ventricle of the Heart. Theory imperfect, until the formation of sufficient vapor or steam in the lungs is perceived and acknowledged. TO DR. MARCY.--In complying with your request to write for your journal an article embodying my theory of the motive powers which produce the circulation of the blood, together with some account of its rise and progress, I obey what I regard as a call of duty; and thus requested, do it with pleasure.…
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