. Kirkes' handbook of physiology . to large animals,such as the horse; third, because the intraventricular changes of pressureare communicated to the recording tambour by a long elastic column of air;and fourth, because the tambour arrangement has a tendency to recordinertia vibrations. H. D. Rolleston, who has pointed out the above im-perfections of Mareys method, has reinvestigated the subject with a moresuitable apparatus. Kit; THE CIRCULATION OF THE BLOOD The method adopted by Rolleston is as follows: A window is made in the chest of an anesthetized and curarized animal, and an appro-priat
. Kirkes' handbook of physiology . to large animals,such as the horse; third, because the intraventricular changes of pressureare communicated to the recording tambour by a long elastic column of air;and fourth, because the tambour arrangement has a tendency to recordinertia vibrations. H. D. Rolleston, who has pointed out the above im-perfections of Mareys method, has reinvestigated the subject with a moresuitable apparatus. Kit; THE CIRCULATION OF THE BLOOD The method adopted by Rolleston is as follows: A window is made in the chest of an anesthetized and curarized animal, and an appro-priately curved glass cannula introduced through an opening in the auricular cannula is then passed through the auriculo-ventricular orifice without causing anyappreciable regurgitation, into the auricle, or it may be introduced into the cavity of theright or left ventricle by an opening made in the apex of the heart. In some experimentsthe trocar is pushed through the chest wall into the ventricular cavity. His apparatus. Fig. 164.—Endocardiac Pressure Curve from the Left Ventricle of the Dog. The thorax wasopened and a cannula introduced through the apex of the ventricle; the abscissa is the line of at-mospheric pressure. 5 to D represents the ventricular contraction; from D to the next rise at Grepresents the ventricular diastole. The notch, at the top of which is F, is a post-ventricular risein pressure from below that of the atmosphere, and not a presystolic or auricular rise in pressure. is filled with a solution of leech extract in per cent saline solution, or with a solutionof sodium bicarbonate of specific gravity 1083. The animals employed were chiefly dogs. The movement of the column of blood iscommunicated to the writing lever by means of a vulcanite piston which moves with littlefriction in a brass tube connected with a glass cannula by means of a short connectingtube. When the lower part of the tube, A, is placed in communication with one of the cav
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