Abstract
With the method of perfusing an isolated rabbit-heart recently reported by the author, the heart did not sufficiently manifest its activities in parallel recordings of pressures in the pulmonary artery and vein, aorta and vena cava, though the activities could be observed with the naked eye.
By slightly modifying the method and experimental procedures, the heart was found to manifest its activities sufficiently in the parallel recordings of the pres-sures during some three hours.
