. Barometric pressure : researches in experimental physiology. Atmospheric pressure; Physiology, Comparative; Anoxemia; Altitude, Influence of. Compressed Air; Low Pressures 773 be taken are to ventilate the bell properly before inserting the stopper, to make a record only when the animal is very calm, and for compressed air, to avoid variations of pressure during the recording. Experiment CCCXXXIV. February 12. A cat is placed under the bell. At normal pressure it gives the tracing in Figure 67. We take it into the compression cylinder and in about an hour, reach a compression of +53 cm. (tot
. Barometric pressure : researches in experimental physiology. Atmospheric pressure; Physiology, Comparative; Anoxemia; Altitude, Influence of. Compressed Air; Low Pressures 773 be taken are to ventilate the bell properly before inserting the stopper, to make a record only when the animal is very calm, and for compressed air, to avoid variations of pressure during the recording. Experiment CCCXXXIV. February 12. A cat is placed under the bell. At normal pressure it gives the tracing in Figure 67. We take it into the compression cylinder and in about an hour, reach a compression of +53 cm. (total pressure 128 cm.) We then obtain the tracing in Figure 68. Examination of these two tracings shows: 1) that the number of respirations has diminished (in the proportion of 10 to 7); 2) that the amplitude of the oscillations has likewise diminished, that is, that the variations of the intra-thoracic air pressure were less in compressed air than at normal pressure. F. Arterial Pressure. The increase of the arterial pressure under the influence of com- pressed air has been admitted on the strength of the sphymographic tracings of Vivenot; but no direct experiment had been made, or rather had succeeded, in the aim of ascertaining by the manometer the direction and the amount of the modification. I have tried to fill this gap by the following experiments. Experiment CCCXXXV. February 17. Dog of average size, new subject, fastened upon the dog board. Ludwig's recording manometer, attached to a cannulated femoral artery, gives the tracing of Figure 69, in which the low points are cm. above the zero line, which indicates a pressure of 11 cm., and. Fig. 69—Tension of the blood in the femoral artery. Normal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bert, Paul, 1833-1886; Hitchcock, Mary Alice
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