. Barometric pressure : researches in experimental physiology. Atmospheric pressure; Physiology, Comparative; Anoxemia; Altitude, Influence of. Gases of the Blood 591 To study the influence of the number of respirations by isolating it from that of the general movements of the body, which is always involved, I poisoned the animals by curare, and when they were completely paralyzed, I made use of artificial respiration by means of a bellows introduced into the trachea. This bellows (Fig. 26) has an intake valve A, furnished with a tube permitting any gas to be pumped into the lungs, and with a
. Barometric pressure : researches in experimental physiology. Atmospheric pressure; Physiology, Comparative; Anoxemia; Altitude, Influence of. Gases of the Blood 591 To study the influence of the number of respirations by isolating it from that of the general movements of the body, which is always involved, I poisoned the animals by curare, and when they were completely paralyzed, I made use of artificial respiration by means of a bellows introduced into the trachea. This bellows (Fig. 26) has an intake valve A, furnished with a tube permitting any gas to be pumped into the lungs, and with a graduated guide bar provided with a slide to control the move- ments of the bellows. The variable position of the slide determines the quantity of air injected. With this instrument, nothing is easier than to measure exactly the amplitude and the number of. Fig. 26—Bellows for artificial respiration (A, pipe with valve which per- mits the use of any gas). the artificial respirations. When the cannula has been introduced into the trachea, which it does not quite fill, the little space left between it and the walls is sufficient for the expiration to be made easily; besides, in this respect conditions are always identical. I also used the apparatus construed according to the specifica- tions of M. Grehant, which in my laboratory is operated by a small water motor. Here is the result of an experiment, taken as an example. Experiment CLVII. February 19. Dog weighing 18 kilograms. At 4:05, lethal dose of curare subcutaneously; falls at 4:25; trachea opened and artificial respiration carried on, the bellows delivering 350 cc. At 4:40, the artificial respiration is fixed at 16 per minute; the pulse is 90. At 4:50, 72 cc. of blood taken from the femoral artery ... A. 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
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