A critical analysis of the memoir read by Dr. Barry before the Academy of Sciences : on the 8th of June, 1825, at the Institute of France, on atmospheric pressure; being the principal cause of the progression of the blood in the veins. / By Henry Searle.

  • Searle, Henry, active 1827.
Date:
1827
Catalogue details

Licence: Public Domain Mark

Credit: A critical analysis of the memoir read by Dr. Barry before the Academy of Sciences : on the 8th of June, 1825, at the Institute of France, on atmospheric pressure; being the principal cause of the progression of the blood in the veins. / By Henry Searle. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    ward the sternum, and when the diaphragm presses down the abdominal viscera, the internal surface of the thorax is also enlarged; conse- quently, the pluree covering these surfaces is put upon the stretch, and that portion covering the pericardium on either side, is pulled upon at its margins, on both sides, in the directions best calculated not only to protect the fibrous bag from pressure, but to enlarge its cavity throughout. The motion of the sternum during inspiration, tends to bring the anterior surface of the pericar- dium forwards and upwards. The synchronous movement of the diaphragm, tends to enlarge it downwards, and to complete the analogy. As each lung is furnished with a pipe, through which it receives and discharges air, so is the heart, with its receiving pipes (the veins), and its discharging pipes (the arteries), through which it receives and discharges blood. But as the aorta, the great discharging pipe of the heart, is equally employed during both stages of respiration, in sending blood out of the thorax, it seemed probable (if my reasoning with regard to the effect of inspiration upon the