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PROCEEDINGS OF THE PHYSIOLOGICAL SOCIETY

We have described [1935] the effects of stimulating the central end of the cervical vagus, below a spot cooled to 80 C. or lower, as an acceleration of the breathing in place of the inhibition normally occurring. Gessell, et al. [1937] have suggested that the results we obtained, and ascribed to the excitation of fibres coming from the lungs carrying impulses the function of which is to augment the excitability of the respiratory centre, are due to the excitation of sensory fibres in the vagus, not necessarily coming from the lungs, and have the same explanation as the respiratory response to stimulation of any sensory nerve, effects which are commonly ascribed to pain. With a view to examining the validity of this criticism a comparison has been made between the effects of exciting the vagus and a somatic sensory nerve (sciatic, peroneal and saphenous). The normal effect of stimulating the central end of the sciatic, in the anesthetized animal, is a great increase in the rate and usually a considerable increase in depth of breathing. With light anessthesia tonic expansion of the thorax, with irregular, rapid and shallow respiration, occurs. We find that these effects on respiration are absent in the decerebrate animal, while the augmentor effect of exciting the vagus below a cooled spot is equally well shown in the decerebrate as in the ansesthetized preparation. We have assumed, further, that if the augmentor fibres in the vagus were comparable to those present in a sensory nerve, the stimulation of which gives rise to a reflex acceleration of the breathing, the effect of cooling would be similar.