Produced by Frank van Drogen, Laura Wisewell and the Online Distributed Proofreading Team at http://www.pgdp.net (This book was produced from scanned images of public domain material from the Google Print project.) THEORY OF CIRCULATION BY RESPIRATION. SYNOPSIS OF ITS PRINCIPLES AND HISTORY. WRITTEN, BY REQUEST, FOR THE "U. S. JOURNAL OF HOMŒOPATHY," BY EMMA WILLARD. NEW-YORK: FRANCIS HART & CO. PRINTERS AND STATIONERS, 63 CORTLANDT STREET. 1861. THEORY OF CIRCULATION BY RESPIRATION. SECTION I. 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. But my theory, with its history, cannot thus be written without egotism. Logicians say, that the way to convince others is to retrace, in order, the steps by which you yourself became convinced, which is to be egotistic. But in this case, there is a further reason: the scientific discoverer must speak of the apparatus by which he experiments, and mine was often my own physical frame. Twenty years ago, while yet my mind, laboring with this great subject, was condemned "to drudge Without a second and without a judge," you, sir, comprehended the hypothesis which has now become a theory, and you waited not for others to speak, but you fully acknowledged its truth; and although, in Hartford, as now in New-York, you were thronged with practice, (then allopathic), you yet found time to furnish me with added experiments, made in your office, confirmatory of its truth, which by your permission were afterwards added in your name to my published work.