Fig. 2. J., acute katatonic stupor. b is a wave selected from the series in which 6 is sudden call by name. The galvanometer curve (a) is slight, but the change in the pneumograph curve is notable. (Peterson and Jung.[201]) ] As to the _respiratory apparatus_ the effect of emotion in altering the rate and depth of respiration may be shown by the pneumograph; by this method the effects of slight emotion that otherwise would escape observation may be detected. Such a disturbance of respiration is shown in the tracing, Fig. 2. That emotion will profoundly affect the respiration has of course been common knowledge from time immemorial, and has been made use of by writers of fiction and actors for dramatic effect. The same may be said of modifications of the functioning of the whole respiratory apparatus, including the nostrils and the mouth; and likewise of the decrease or increase of secretions (dryness of the mouth from fear, and “foaming” from anger). These are among the well known physiological effects of emotions. Increase of _sweat_ sometimes amounting to an outpour, and alterations in the amount of the various _glandular secretions_ (_salivary_, _gastric_, etc.), and _rigor_ are important phenomena. The remarkable researches of Pawlow[202] and his co-workers in Russia on the _work of the digestive glands_, and those of Cannon[203] in America on the _movements of the stomach and intestines_ have revealed that these functions are influenced in an astonishing degree by psychical factors.